A programming language is an artificial language designed to communicate instructions to a machine, particularly a computer. Programming languages can be used to create programs that control the behavior of a machine and/or to express algorithms precisely.

The earliest programming languages predate the invention of the computer, and were used to direct the behavior of machines such as Jacquard looms and player pianos. Thousands of different programming languages have been created, mainly in the computer field, with many more being created every year. Most programming languages describe computation in an imperative style, i.e., as a sequence of commands, although some languages, such as those that support functional programming or logic programming, use alternative forms of description.

A programming language is usually split into the two components of syntax (form) and semantics (meaning). Some languages are defined by a specification document (for example, the C programming language is specified by an ISO Standard), while other languages, such as Perl, have a dominant implementation that is used as a reference.

Definitions

A programming language is a notation for writing programs, which are specifications of a computation or algorithm. Some, but not all, authors restrict the term "programming language" to those languages that can express ''all'' possible algorithms. Traits often considered important for what constitutes a programming language include: ''Function and target:'' A ''computer programming language'' is a language used to write computer programs, which involve a computer performing some kind of computation or algorithm and possibly control external devices such as printers, disk drives, robots, and so on. For example PostScript programs are frequently created by another program to control a computer printer or display. More generally, a programming language may describe computation on some, possibly abstract, machine. It is generally accepted that a complete specification for a programming language includes a description, possibly idealized, of a machine or processor for that language. In most practical contexts, a programming language involves a computer; consequently programming languages are usually defined and studied this way. Programming languages differ from natural languages in that natural languages are only used for interaction between people, while programming languages also allow humans to communicate instructions to machines. ''Abstractions:'' Programming languages usually contain abstractions for defining and manipulating data structures or controlling the flow of execution. The practical necessity that a programming language support adequate abstractions is expressed by the abstraction principle; this principle is sometimes formulated as recommendation to the programmer to make proper use of such abstractions. ''Expressive power:'' The theory of computation classifies languages by the computations they are capable of expressing. All Turing complete languages can implement the same set of algorithms. ANSI/ISO SQL and Charity are examples of languages that are not Turing complete, yet often called programming languages.

Markup languages like XML, HTML or troff, which define structured data, are not generally considered programming languages. Programming languages may, however, share the syntax with markup languages if a computational semantics is defined. XSLT, for example, is a Turing complete XML dialect. Moreover, LaTeX, which is mostly used for structuring documents, also contains a Turing complete subset.

The term ''computer language'' is sometimes used interchangeably with programming language. However, the usage of both terms varies among authors, including the exact scope of each. One usage describes programming languages as a subset of computer languages. In this vein, languages used in computing that have a different goal than expressing computer programs are generically designated computer languages. For instance, markup languages are sometimes referred to as computer languages to emphasize that they are not meant to be used for programming. Another usage regards programming languages as theoretical constructs for programming abstract machines, and computer languages as the subset thereof that runs on physical computers, which have finite hardware resources. John C. Reynolds emphasizes that formal specification languages are just as much programming languages as are the languages intended for execution. He also argues that textual and even graphical input formats that affect the behavior of a computer are programming languages, despite the fact they are commonly not Turing-complete, and remarks that ignorance of programming language concepts is the reason for many flaws in input formats.

Elements

All programming languages have some primitive building blocks for the description of data and the processes or transformations applied to them (like the addition of two numbers or the selection of an item from a collection). These primitives are defined by syntactic and semantic rules which describe their structure and meaning respectively.

Syntax

A programming language's surface form is known as its syntax. Most programming languages are purely textual; they use sequences of text including words, numbers, and punctuation, much like written natural languages. On the other hand, there are some programming languages which are more graphical in nature, using visual relationships between symbols to specify a program.

The syntax of a language describes the possible combinations of symbols that form a syntactically correct program. The meaning given to a combination of symbols is handled by semantics (either formal or hard-coded in a reference implementation). Since most languages are textual, this article discusses textual syntax.

Programming language syntax is usually defined using a combination of regular expressions (for lexical structure) and Backus–Naur Form (for grammatical structure). Below is a simple grammar, based on Lisp:

expression ::= atom | list
atom ::= number | symbol
number ::= [+-]?['0'-'9']+
symbol ::= ['A'-'Z''a'-'z'].*
list ::= '(' expression* ')'

This grammar specifies the following:

an ''expression'' is either an ''atom'' or a ''list'';

an ''atom'' is either a ''number'' or a ''symbol'';

a ''number'' is an unbroken sequence of one or more decimal digits, optionally preceded by a plus or minus sign;

a ''symbol'' is a letter followed by zero or more of any characters (excluding whitespace); and

a ''list'' is a matched pair of parentheses, with zero or more ''expressions'' inside it.

The following are examples of well-formed token sequences in this grammar: '12345', '()', '(a b c232 (1))'

Not all syntactically correct programs are semantically correct. Many syntactically correct programs are nonetheless ill-formed, per the language's rules; and may (depending on the language specification and the soundness of the implementation) result in an error on translation or execution. In some cases, such programs may exhibit undefined behavior. Even when a program is well-defined within a language, it may still have a meaning that is not intended by the person who wrote it.

Using natural language as an example, it may not be possible to assign a meaning to a grammatically correct sentence or the sentence may be false:

"Colorless green ideas sleep furiously." is grammatically well-formed but has no generally accepted meaning.

"John is a married bachelor." is grammatically well-formed but expresses a meaning that cannot be true.

The following C language fragment is syntactically correct, but performs operations that are not semantically defined (the operation *p >> 4 has no meaning for a value having a complex type and p->im is not defined because the value of p is the null pointer):

complex *p = NULL; complex abs_p = sqrt(*p >> 4 + p->im);

If the type declaration on the first line were omitted, the program would trigger an error on compilation, as the variable "p" would not be defined. But the program would still be syntactically correct, since type declarations provide only semantic information.

The grammar needed to specify a programming language can be classified by its position in the Chomsky hierarchy. The syntax of most programming languages can be specified using a Type-2 grammar, i.e., they are context-free grammars. Some languages, including Perl and Lisp, contain constructs that allow execution during the parsing phase. Languages that have constructs that allow the programmer to alter the behavior of the parser make syntax analysis an undecidable problem, and generally blur the distinction between parsing and execution. In contrast to Lisp's macro system and Perl's BEGIN blocks, which may contain general computations, C macros are merely string replacements, and do not require code execution.

Semantics

The term ''semantics'' refers to the meaning of languages, as opposed to their form (syntax).

Static semantics

The static semantics defines restrictions on the structure of valid texts that are hard or impossible to express in standard syntactic formalisms. For compiled languages, static semantics essentially include those semantic rules that can be checked at compile time. Examples include checking that every identifier is declared before it is used (in languages that require such declarations) or that the labels on the arms of a case statement are distinct. Many important restrictions of this type, like checking that identifiers are used in the appropriate context (e.g. not adding an integer to a function name), or that subroutine calls have the appropriate number and type of arguments, can be enforced by defining them as rules in a logic called a type system. Other forms of static analyses like data flow analysis may also be part of static semantics. Newer programming languages like Java and C# have definite assignment analysis, a form of data flow analysis, as part of their static semantics.

Dynamic semantics

Once data has been specified, the machine must be instructed to perform operations on the data. For example, the semantics may define the strategy by which expressions are evaluated to values, or the manner in which control structures conditionally execute statements. The ''dynamic semantics'' (also known as ''execution semantics'') of a language defines how and when the various constructs of a language should produce a program behavior. There are many ways of defining execution semantics. Natural language is often used to specify the execution semantics of languages commonly used in practice. A significant amount of academic research went into formal semantics of programming languages, which allow execution semantics to be specified in a formal manner. Results from this field of research have seen limited application to programming language design and implementation outside academia.

Type system

A type system defines how a programming language classifies values and expressions into ''types'', how it can manipulate those types and how they interact. The goal of a type system is to verify and usually enforce a certain level of correctness in programs written in that language by detecting certain incorrect operations. Any decidable type system involves a trade-off: while it rejects many incorrect programs, it can also prohibit some correct, albeit unusual programs. In order to bypass this downside, a number of languages have ''type loopholes'', usually unchecked casts that may be used by the programmer to explicitly allow a normally disallowed operation between different types. In most typed languages, the type system is used only to type check programs, but a number of languages, usually functional ones, infer types, relieving the programmer from the need to write type annotations. The formal design and study of type systems is known as ''type theory''.

Typed versus untyped languages

A language is ''typed'' if the specification of every operation defines types of data to which the operation is applicable, with the implication that it is not applicable to other types. For example, the data represented by "this text between the quotes" is a string. In most programming languages, dividing a number by a string has no meaning. Most modern programming languages will therefore reject any program attempting to perform such an operation. In some languages, the meaningless operation will be detected when the program is compiled ("static" type checking), and rejected by the compiler, while in others, it will be detected when the program is run ("dynamic" type checking), resulting in a runtime exception.

A special case of typed languages are the ''single-type'' languages. These are often scripting or markup languages, such as REXX or SGML, and have only one data type—most commonly character strings which are used for both symbolic and numeric data.

In contrast, an ''untyped language'', such as most assembly languages, allows any operation to be performed on any data, which are generally considered to be sequences of bits of various lengths. High-level languages which are untyped include BCPL and some varieties of Forth.

In practice, while few languages are considered typed from the point of view of type theory (verifying or rejecting ''all'' operations), most modern languages offer a degree of typing. Many production languages provide means to bypass or subvert the type system.

Static versus dynamic typing

In ''static typing'', all expressions have their types determined prior to when the program is executed, typically at compile-time. For example, 1 and (2+2) are integer expressions; they cannot be passed to a function that expects a string, or stored in a variable that is defined to hold dates.

Statically typed languages can be either ''manifestly typed'' or ''type-inferred''. In the first case, the programmer must explicitly write types at certain textual positions (for example, at variable declarations). In the second case, the compiler ''infers'' the types of expressions and declarations based on context. Most mainstream statically typed languages, such as C++, C# and Java, are manifestly typed. Complete type inference has traditionally been associated with less mainstream languages, such as Haskell and ML. However, many manifestly typed languages support partial type inference; for example, Java and C# both infer types in certain limited cases.

''Dynamic typing'', also called ''latent typing'', determines the type-safety of operations at runtime; in other words, types are associated with ''runtime values'' rather than ''textual expressions''. As with type-inferred languages, dynamically typed languages do not require the programmer to write explicit type annotations on expressions. Among other things, this may permit a single variable to refer to values of different types at different points in the program execution. However, type errors cannot be automatically detected until a piece of code is actually executed, potentially making debugging more difficult. Ruby, Lisp, JavaScript, and Python are dynamically typed.

Weak and strong typing

''Weak typing'' allows a value of one type to be treated as another, for example treating a string as a number. This can occasionally be useful, but it can also allow some kinds of program faults to go undetected at compile time and even at run-time.

''Strong typing'' prevents the above. An attempt to perform an operation on the wrong type of value raises an error. Strongly typed languages are often termed ''type-safe'' or ''safe''.

An alternative definition for "weakly typed" refers to languages, such as Perl and JavaScript, which permit a large number of implicit type conversions. In JavaScript, for example, the expression 2 * x implicitly converts x to a number, and this conversion succeeds even if x is null, undefined, an Array, or a string of letters. Such implicit conversions are often useful, but they can mask programming errors. ''Strong'' and ''static'' are now generally considered orthogonal concepts, but usage in the literature differs. Some use the term ''strongly typed'' to mean ''strongly, statically typed'', or, even more confusingly, to mean simply ''statically typed''. Thus C has been called both strongly typed and weakly, statically typed.

Standard library and run-time system

Most programming languages have an associated core library (sometimes known as the 'standard library', especially if it is included as part of the published language standard), which is conventionally made available by all implementations of the language. Core libraries typically include definitions for commonly used algorithms, data structures, and mechanisms for input and output.

A language's core library is often treated as part of the language by its users, although the designers may have treated it as a separate entity. Many language specifications define a core that must be made available in all implementations, and in the case of standardized languages this core library may be required. The line between a language and its core library therefore differs from language to language. Indeed, some languages are designed so that the meanings of certain syntactic constructs cannot even be described without referring to the core library. For example, in Java, a string literal is defined as an instance of the java.lang.String class; similarly, in Smalltalk, an anonymous function expression (a "block") constructs an instance of the library's BlockContext class. Conversely, Scheme contains multiple coherent subsets that suffice to construct the rest of the language as library macros, and so the language designers do not even bother to say which portions of the language must be implemented as language constructs, and which must be implemented as parts of a library.

Design and implementation

Programming languages share properties with natural languages related to their purpose as vehicles for communication, having a syntactic form separate from its semantics, and showing ''language families'' of related languages branching one from another. But as artificial constructs, they also differ in fundamental ways from languages that have evolved through usage. A significant difference is that a programming language can be fully described and studied in its entirety, since it has a precise and finite definition. By contrast, natural languages have changing meanings given by their users in different communities. While constructed languages are also artificial languages designed from the ground up with a specific purpose, they lack the precise and complete semantic definition that a programming language has.

Many programming languages have been designed from scratch, altered to meet new needs, and combined with other languages. Many have eventually fallen into disuse. Although there have been attempts to design one "universal" programming language that serves all purposes, all of them have failed to be generally accepted as filling this role. The need for diverse programming languages arises from the diversity of contexts in which languages are used:

Programs range from tiny scripts written by individual hobbyists to huge systems written by hundreds of programmers.

Programmers range in expertise from novices who need simplicity above all else, to experts who may be comfortable with considerable complexity.

Programs must balance speed, size, and simplicity on systems ranging from microcontrollers to supercomputers.

Programs may be written once and not change for generations, or they may undergo continual modification.

Finally, programmers may simply differ in their tastes: they may be accustomed to discussing problems and expressing them in a particular language.

One common trend in the development of programming languages has been to add more ability to solve problems using a higher level of abstraction. The earliest programming languages were tied very closely to the underlying hardware of the computer. As new programming languages have developed, features have been added that let programmers express ideas that are more remote from simple translation into underlying hardware instructions. Because programmers are less tied to the complexity of the computer, their programs can do more computing with less effort from the programmer. This lets them write more functionality per time unit.

Natural language processors have been proposed as a way to eliminate the need for a specialized language for programming. However, this goal remains distant and its benefits are open to debate. Edsger W. Dijkstra took the position that the use of a formal language is essential to prevent the introduction of meaningless constructs, and dismissed natural language programming as "foolish". Alan Perlis was similarly dismissive of the idea. Hybrid approaches have been taken in Structured English and SQL.

A language's designers and users must construct a number of artifacts that govern and enable the practice of programming. The most important of these artifacts are the language ''specification'' and ''implementation''.

Specification

The specification of a programming language is intended to provide a definition that the language users and the implementors can use to determine whether the behavior of a program is correct, given its source code.

A programming language specification can take several forms, including the following: An explicit definition of the syntax, static semantics, and execution semantics of the language. While syntax is commonly specified using a formal grammar, semantic definitions may be written in natural language (e.g., as in the C language), or a formal semantics (e.g., as in Standard ML and Scheme specifications).

A description of the behavior of a translator for the language (e.g., the C++ and Fortran specifications). The syntax and semantics of the language have to be inferred from this description, which may be written in natural or a formal language.

A ''reference'' or ''model'' implementation, sometimes written in the language being specified (e.g., Prolog or ANSI REXX). The syntax and semantics of the language are explicit in the behavior of the reference implementation.

Implementation

An implementation of a programming language provides a way to execute that program on one or more configurations of hardware and software. There are, broadly, two approaches to programming language implementation: ''compilation'' and ''interpretation''. It is generally possible to implement a language using either technique.

The output of a compiler may be executed by hardware or a program called an interpreter. In some implementations that make use of the interpreter approach there is no distinct boundary between compiling and interpreting. For instance, some implementations of BASIC compile and then execute the source a line at a time.

Programs that are executed directly on the hardware usually run several orders of magnitude faster than those that are interpreted in software.

One technique for improving the performance of interpreted programs is just-in-time compilation. Here the virtual machine, just before execution, translates the blocks of bytecode which are going to be used to machine code, for direct execution on the hardware.

Usage

Thousands of different programming languages have been created, mainly in the computing field. Programming languages differ from most other forms of human expression in that they require a greater degree of precision and completeness.

When using a natural language to communicate with other people, human authors and speakers can be ambiguous and make small errors, and still expect their intent to be understood. However, figuratively speaking, computers "do exactly what they are told to do", and cannot "understand" what code the programmer intended to write. The combination of the language definition, a program, and the program's inputs must fully specify the external behavior that occurs when the program is executed, within the domain of control of that program. On the other hand, ideas about an algorithm can be communicated to humans without the precision required for execution by using pseudocode, which interleaves natural language with code written in a programming language.

A programming language provides a structured mechanism for defining pieces of data, and the operations or transformations that may be carried out automatically on that data. A programmer uses the abstractions present in the language to represent the concepts involved in a computation. These concepts are represented as a collection of the simplest elements available (called primitives). ''Programming'' is the process by which programmers combine these primitives to compose new programs, or adapt existing ones to new uses or a changing environment.

Programs for a computer might be executed in a batch process without human interaction, or a user might type commands in an interactive session of an interpreter. In this case the "commands" are simply programs, whose execution is chained together. When a language is used to give commands to a software application (such as a shell) it is called a scripting language.

Measuring language usage

It is difficult to determine which programming languages are most widely used, and what usage means varies by context. One language may occupy the greater number of programmer hours, a different one have more lines of code, and a third utilize the most CPU time. Some languages are very popular for particular kinds of applications. For example, COBOL is still strong in the corporate data center, often on large mainframes; FORTRAN in scientific and engineering applications; and C in embedded applications and operating systems. Other languages are regularly used to write many different kinds of applications.

Various methods of measuring language popularity, each subject to a different bias over what is measured, have been proposed: counting the number of job advertisements that mention the language the number of books sold that teach or describe the language estimates of the number of existing lines of code written in the language—which may underestimate languages not often found in public searches

counts of language references (i.e., to the name of the language) found using a web search engine.

Combining and averaging information from various internet sites, langpop.com claims that in 2008 the 10 most cited programming languages are (in alphabetical order): C, C++, C#, Java, JavaScript, Perl, PHP, Python, Ruby, and SQL.

Taxonomies

There is no overarching classification scheme for programming languages. A given programming language does not usually have a single ancestor language. Languages commonly arise by combining the elements of several predecessor languages with new ideas in circulation at the time. Ideas that originate in one language will diffuse throughout a family of related languages, and then leap suddenly across familial gaps to appear in an entirely different family.

The task is further complicated by the fact that languages can be classified along multiple axes. For example, Java is both an object-oriented language (because it encourages object-oriented organization) and a concurrent language (because it contains built-in constructs for running multiple threads in parallel). Python is an object-oriented scripting language.

In broad strokes, programming languages divide into ''programming paradigms'' and a classification by ''intended domain of use''. Traditionally, programming languages have been regarded as describing computation in terms of imperative sentences, i.e. issuing commands. These are generally called imperative programming languages. A great deal of research in programming languages has been aimed at blurring the distinction between a program as a set of instructions and a program as an assertion about the desired answer, which is the main feature of declarative programming. More refined paradigms include procedural programming, object-oriented programming, functional programming, and logic programming; some languages are hybrids of paradigms or multi-paradigmatic. An assembly language is not so much a paradigm as a direct model of an underlying machine architecture. By purpose, programming languages might be considered general purpose, system programming languages, scripting languages, domain-specific languages, or concurrent/distributed languages (or a combination of these). Some general purpose languages were designed largely with educational goals.

A programming language may also be classified by factors unrelated to programming paradigm. For instance, most programming languages use English language keywords, while a minority do not. Other languages may be classified as being esoteric or not.

History

Early developments

The first programming languages predate the modern computer. The 19th century had "programmable" looms and player piano scrolls which implemented what are today recognized as examples of domain-specific languages. By the beginning of the twentieth century, punch cards encoded data and directed mechanical processing. In the 1930s and 1940s, the formalisms of Alonzo Church's lambda calculus and Alan Turing's Turing machines provided mathematical abstractions for expressing algorithms; the lambda calculus remains influential in language design.

In the 1940s, the first electrically powered digital computers were created. The first high-level programming language to be designed for a computer was Plankalkül, developed for the German Z3 by Konrad Zuse between 1943 and 1945. However, it was not implemented until 1998 and 2000.

Programmers of early 1950s computers, notably UNIVAC I and IBM 701, used machine language programs, that is, the first generation language (1GL). 1GL programming was quickly superseded by similarly machine-specific, but mnemonic, second generation languages (2GL) known as assembly languages or "assembler". Later in the 1950s, assembly language programming, which had evolved to include the use of macro instructions, was followed by the development of "third generation" programming languages (3GL), such as FORTRAN, LISP, and COBOL. 3GLs are more abstract and are "portable", or at least implemented similarly on computers that do not support the same native machine code. Updated versions of all of these 3GLs are still in general use, and each has strongly influenced the development of later languages. At the end of the 1950s, the language formalized as ALGOL 60 was introduced, and most later programming languages are, in many respects, descendants of Algol. The format and use of the early programming languages was heavily influenced by the constraints of the interface.

Refinement

The period from the 1960s to the late 1970s brought the development of the major language paradigms now in use, though many aspects were refinements of ideas in the very first Third-generation programming languages: APL introduced ''array programming'' and influenced functional programming.

PL/I (NPL) was designed in the early 1960s to incorporate the best ideas from FORTRAN and COBOL.

In the 1960s, Simula was the first language designed to support ''object-oriented programming''; in the mid-1970s, Smalltalk followed with the first "purely" object-oriented language.

C was developed between 1969 and 1973 as a ''system programming'' language, and remains popular.

Prolog, designed in 1972, was the first ''logic programming'' language.

In 1978, ML built a polymorphic type system on top of Lisp, pioneering ''statically typed functional programming'' languages.

Each of these languages spawned an entire family of descendants, and most modern languages count at least one of them in their ancestry.

The 1960s and 1970s also saw considerable debate over the merits of ''structured programming'', and whether programming languages should be designed to support it. Edsger Dijkstra, in a famous 1968 letter published in the Communications of the ACM, argued that GOTO statements should be eliminated from all "higher level" programming languages.

The 1960s and 1970s also saw expansion of techniques that reduced the footprint of a program as well as improved productivity of the programmer and user. The card deck for an early 4GL was a lot smaller for the same functionality expressed in a 3GL deck.

Consolidation and growth

The 1980s were years of relative consolidation. C++ combined object-oriented and systems programming. The United States government standardized Ada, a systems programming language derived from Pascal and intended for use by defense contractors. In Japan and elsewhere, vast sums were spent investigating so-called "fifth generation" languages that incorporated logic programming constructs. The functional languages community moved to standardize ML and Lisp. Rather than inventing new paradigms, all of these movements elaborated upon the ideas invented in the previous decade.

One important trend in language design for programming large-scale systems during the 1980s was an increased focus on the use of ''modules'', or large-scale organizational units of code. Modula-2, Ada, and ML all developed notable module systems in the 1980s, although other languages, such as PL/I, already had extensive support for modular programming. Module systems were often wedded to generic programming constructs.

The rapid growth of the Internet in the mid-1990s created opportunities for new languages. Perl, originally a Unix scripting tool first released in 1987, became common in dynamic websites. Java came to be used for server-side programming, and bytecode virtual machines became popular again in commercial settings with their promise of "Write once, run anywhere" (UCSD Pascal had been popular for a time in the early 1980s). These developments were not fundamentally novel, rather they were refinements to existing languages and paradigms, and largely based on the C family of programming languages.

Programming language evolution continues, in both industry and research. Current directions include security and reliability verification, new kinds of modularity (mixins, delegates, aspects), and database integration such as Microsoft's LINQ.

The 4GLs are examples of languages which are domain-specific, such as SQL, which manipulates and returns sets of data rather than the scalar values which are canonical to most programming languages. Perl, for example, with its 'here document' can hold multiple 4GL programs, as well as multiple JavaScript programs, in part of its own perl code and use variable interpolation in the 'here document' to support multi-language programming.

See also

Comparison of programming languages (basic instructions)

Comparison of programming languages

Computer programming

Computer science and Outline of computer science

Educational programming language

Invariant based programming

Lists of programming languages

List of programming language researchers

Literate programming

Dialect (computing)

Programming language theory

Pseudocode

Scientific language

Software engineering and List of software engineering topics

References

Further reading

Harold Abelson and Gerald Jay Sussman. ''Structure and Interpretation of Computer Programs'' (2nd ed.), The MIT Press 1996.

Raphael Finkel: ''Advanced Programming Language Design'', Addison Wesley 1995.

Daniel P. Friedman, Mitchell Wand, Christopher T. Haynes: ''Essentials of Programming Languages'', The MIT Press 2001.

Maurizio Gabbrielli and Simone Martini: "Programming Languages: Principles and Paradigms", Springer, 2010.

David Gelernter, Suresh Jagannathan: ''Programming Linguistics'', The MIT Press 1990.

Ellis Horowitz (ed.): ''Programming Languages, a Grand Tour'' (3rd ed.), 1987.

Ellis Horowitz: ''Fundamentals of Programming Languages'', 1989.

Shriram Krishnamurthi: ''Programming Languages: Application and Interpretation'', online publication.

Bruce J. MacLennan: ''Principles of Programming Languages: Design, Evaluation, and Implementation'', Oxford University Press 1999.

John C. Mitchell: ''Concepts in Programming Languages'', Cambridge University Press 2002.

Benjamin C. Pierce: ''Types and Programming Languages'', The MIT Press 2002.

Terrence W. Pratt and Marvin V. Zelkowitz: ''Programming Languages: Design and Implementation'' (4th ed.), Prentice Hall 2000.

Peter H. Salus. ''Handbook of Programming Languages'' (4 vols.). Macmillan 1998.

Ravi Sethi: ''Programming Languages: Concepts and Constructs'', 2nd ed., Addison-Wesley 1996.

Michael L. Scott: ''Programming Language Pragmatics'', Morgan Kaufmann Publishers 2005.

Robert W. Sebesta: ''Concepts of Programming Languages'', 9th ed., Addison Wesley 2009.

Franklyn Turbak and David Gifford with Mark Sheldon: ''Design Concepts in Programming Languages'', The MIT Press 2009.

Peter Van Roy and Seif Haridi. ''Concepts, Techniques, and Models of Computer Programming'', The MIT Press 2004.

David A. Watt. ''Programming Language Concepts and Paradigms''. Prentice Hall 1990.

David A. Watt and Muffy Thomas. ''Programming Language Syntax and Semantics''. Prentice Hall 1991.

David A. Watt. ''Programming Language Processors''. Prentice Hall 1993.

David A. Watt. ''Programming Language Design Concepts''. John Wiley & Sons 2004.

External links

99 Bottles of Beer A collection of implementations in many languages.

Category:Notation

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Coordinates	1°15′″N116°50′″N
order	44th
office	President of the United States
term start	January 20, 2009
vicepresident	Joe Biden
predecessor	George W. Bush
birth date	August 04, 1961
birth place	Honolulu, Hawaii, United States
birthname	Barack Hussein Obama II
nationality	American
party	Democratic
spouse	Michelle Obama (m. 1992)
children	Malia (b.1998) Sasha (b.2001)
residence	The White House
alma mater	Occidental CollegeColumbia University (B.A.)Harvard Law School (J.D.)
profession	Community organizerAttorneyAuthorConstitutional law professorUnited States SenatorPresident of the United States
religion	Christian, former member of United Church of Christ
signature	Barack Obama signature.svg
website	WhiteHouse.gov
footnotes	}}

The Presidency of Barack Obama began at noon EST on January 20, 2009, when he became the 44th President of the United States. Obama was a United States Senator from Illinois at the time of his victory over Arizona Senator John McCain in the 2008 presidential election. Barack Obama is the first African-American president of the United States, as well as the first born in Hawaii.

His policy decisions have addressed a global financial crisis and have included changes in tax policies, legislation to reform the United States health care industry, foreign policy initiatives and the phasing out of detention of prisoners at the Guantanamo Bay detention camp in Cuba. He attended the G-20 London summit and later visited U.S. troops in Iraq. On the tour of various European countries following the G-20 summit, he announced in Prague that he intended to negotiate substantial reduction in the world's nuclear arsenals, en route to their eventual extinction. In October 2009, Obama was awarded the Nobel Peace Prize for "his extraordinary efforts to strengthen international diplomacy and cooperation between peoples."

Transition period

The presidential transition period began following Obama's election to the presidency on November 4, 2008. The Obama-Biden Transition Project was co-chaired by John Podesta, Valerie Jarrett, and Pete Rouse. During the transition period, Obama announced his nominations for his Cabinet and administration. Shortly after the election on November 4, Obama chose Representative Rahm Emanuel of Illinois as White House Chief of Staff.

Cabinet nominations included former Democratic primary opponents Hillary Rodham Clinton for Secretary of State and Bill Richardson for Secretary of Commerce (although the latter withdrew on January 4, 2009). Obama appointed Eric Holder as his Attorney General, the first African-American appointed to that position. He also nominated Timothy F. Geithner to serve as Secretary of the Treasury. On December 1, Obama announced that he had asked Robert Gates to remain as Secretary of Defense, making Gates the first Defense head to carry over from a president of a different party. He nominated former Assistant Secretary of State for African Affairs Susan Rice to the United States Ambassador to the United Nations, which he restored to a Cabinet-level position.

During his transition, he maintained a website Change.gov, on which he wrote blogs to readers and uploaded video addresses by many of the members of his new cabinet. He announced strict rules for federal lobbyists, restricting them from financially contributing to his administration and forcing them to stop lobbying while working for him. The website also allowed individuals to share stories and visions with each other and the transition team in what was called the Citizen's Briefing Book, which was given to Obama shortly after his inauguration. Most of the information from Change.gov was transferred to the official White House website whitehouse.gov just after Obama's inauguration.

Inauguration

Barack Obama was inaugurated on January 20, 2009. He officially assumed the presidency at 12:00 noon, EST, and completed the oath of office at 12:05 PM, EST. He delivered his inaugural address immediately following his oath. After his speech, he went to the President's Room in the House Wing of the Capitol and signed three documents: a commemorative proclamation, a list of Cabinet appointments, and a list of sub-Cabinet appointments, before attending a luncheon with congressional and administration leaders and invited guests. To commemorate the 200th anniversary of the birth of former President Abraham Lincoln, the same Bible that was used for Lincoln's inauguration was used in Obama's inauguration.

In administering the oath, Chief Justice John G. Roberts misplaced the word "faithfully" and erroneously replaced the phrase "President of the United States" with "President to the United States" before restating the phrase correctly; since Obama initially repeated the incorrect form, some scholars argued the President should take the oath again. On January 21, Roberts readministered the oath to Obama in a private ceremony in the White House Map Room, making him the seventh U.S. president to retake the oath; White House Counsel Greg Craig said Obama took the oath from Roberts a second time out of an "abundance of caution".

First 100 days

Expectations

Obama's 100th day in office was April 29, 2009. In his first post-election interview with ''60 Minutes'', Obama said that he has been studying Roosevelt's first 100 days, while adding, "The first hundred days is going to be important, but it's probably going to be the first thousand days that makes the difference."

Obama's first 100 days were highly anticipated ever since he became the presumptive nominee. Several news outlets created web pages dedicated to covering the subject. Commentators weighed in on challenges and priorities within domestic, foreign, economic, and environmental policy. CNN lists a number of economic issues that "Obama and his team will have to tackle in their first 100 days", foremost among which is passing and implementing a recovery package to deal with the financial crisis. Clive Stafford Smith, a British human rights lawyer, expressed hopes that the new president will close Guantanamo Bay detention camp in his first 100 days in office. After aides of the president announced his intention to give a major foreign policy speech in the capital of an Islamic country, there were speculations in Jakarta that he might return to his former home city within the first 100 days.

''The New York Times'' devoted a five-part series, which was spread out over two weeks, to anticipatory analysis of Obama's first hundred days. Each day, the analysis of a political expert was followed by freely edited blog postings from readers. The writers compared Obama's prospects with the situations of Franklin D. Roosevelt (January 16, Jean Edward Smith), John F. Kennedy (January 19, Richard Reeves), Lyndon B. Johnson (January 23, Robert Dallek), Ronald Reagan (January 27, Lou Cannon), and Richard Nixon.

Legislation and executive orders

Within minutes of taking the Oath of Office on January 20, Obama's Chief of Staff, Rahm Emanuel, issued an order suspending last-minute federal regulations pushed through by outgoing President George W. Bush, planning to review everything still pending. Due to the economic crisis, the President enacted a pay freeze for Senior White House Staff making more than $100,000 per year, as well as announcing stricter guidelines regarding lobbyists in an effort to raise the ethical standards of the White House. He asked for a waiver to his own new rules, however, for the appointments of William Lynn to the position of Deputy Defense Secretary, Jocelyn Frye to the position of director of policy and projects in the Office of the First Lady, and Cecilia Muñoz to the position of director of intergovernmental affairs in the executive office of the president, leading to some criticism of hypocrisy and violation of his pledge for governmental openness.

In his first week in office, Obama signed Executive Order 13492 suspending all the ongoing proceedings of Guantanamo military commission and ordering the detention facility to be shut down within the year. He also signed Executive Order 13491 - Ensuring Lawful Interrogations requiring the Army Field Manual to be used as a guide for terror interrogations, banning torture and other coercive techniques, such as waterboarding. Obama also issued an executive order entitled "Ethics Commitments by Executive Branch Personnel", setting stricter limitations on incoming executive branch employees and placing tighter restrictions on lobbying in the White House. Obama signed two Presidential Memoranda concerning energy independence, ordering the Department of Transportation to establish higher fuel efficiency standards before 2011 models are released and allowing states to raise their emissions standards above the national standard. He also ended the Mexico City Policy, which banned federal grants to international groups that provide abortion services or counseling.

In his first week he also established a policy of producing a weekly Saturday morning video address available on whitehouse.gov and YouTube, much like those released during his transition period. The first address had been viewed by 600,000 YouTube viewers by the next afternoon.

The first piece of legislation Obama signed was the Lilly Ledbetter Fair Pay Act of 2009 on January 29, which revised the statute of limitations for filing pay discrimination lawsuits. Lilly Ledbetter joined Obama and his wife, Michelle, as he signed the bill, fulfilling his campaign pledge to nullify ''Ledbetter v. Goodyear''. On February 3, he signed the Children's Health Insurance Program Reauthorization Act (CHIP), expanding health care from 7 million children under the plan to 11 million.

| format = Ogg | type = speech }} After much debate, the American Recovery and Reinvestment Act (ARRA) was passed by both the House and Senate on February 13, 2009. Originally intended to be a bipartisan bill, the passage of the bill was largely along party lines. No Republicans voted for it in the House, and three moderate Republicans voted for it in the Senate (Susan Collins and Olympia Snowe of Maine and Arlen Specter of Pennsylvania). The bill combined tax breaks with spending on infrastructure projects, extension of welfare benefits, and education. The final cost of the bill was $787 billion, and almost $1.2 trillion with debt service included. Obama signed the Act into law on February 17, 2009, in Denver, Colorado.

On March 9, 2009, Obama lifted restrictions on federal funding of embryonic stem cell research, and in doing so, called into question some of George W. Bush's signing statements. Obama stated that he too would employ signing statements if he deems upon review that a portion of a bill is unconstitutional, and he has issued several signing statements.

Early in his presidency, Obama signed a law raising the tobacco tax 62 cents on a pack of cigarettes. The tax is to be "used to finance a major expansion of health insurance for children", and "help some [smokers] to quit and persuade young people not to start".

In October 2011, Obama instituted the We Can't Wait program, which involved using executive orders, administrative rulemaking, and recess appointments to institute policies without the support of Congress. The initiative was developed in response to Congress's unwillingness to pass economic legislation proposed by Obama, and conflicts in Congress during the 2011 debt ceiling crisis.

Approval ratings and opinion

2009

After his transition period, Obama entered office with an approval rating of 82%. At the end of his first week, 68% of respondents in a Gallup poll approved of how Obama was handling his job, matching the early approval ratings of Dwight D. Eisenhower and trailing only John F. Kennedy in post-World War II presidents.

Throughout early February polls showed scattered approval ratings: 62% (CBS News), 64% (USA Today/Gallup), 66% (Gallup), and 76% in an outlier poll (CNN/Opinion Research). Gallup reported the congressional address in late February boosted his approval from a term-low of 59% to 67%.

Throughout autumn 2009, Rasmussen estimated Obama's approval as fluctuating between 45% and 52% and his disapproval between 48% and 54%; as of November 11, Pew Research estimated Obama's approval between 51% and 55% and his disapproval between 33% and 37% since July.

Handling of the economy

Rasmussen reported in mid-February 2009, that 55% of voters gave Obama good or excellent marks on his handling of the economy. In early March, a ''The Wall Street Journal'' survey of 49 economists gave Obama an average grade of 59 out of 100, with 42% of the respondents surveyed giving the administration's economic policies a grade below 60 percent. In comparison, only 30% of those same economists considered the response of governments around the world to the global recession to have been adequate. In April, a Gallup poll showed trust in Obama's economic policy with 71% saying they had "a fair amount" or "a great deal" of confidence in Obama's handling of the economy, higher than for Ben Bernanke, Tim Geithner, or leaders of Congress. Another Gallup poll in June showed 55% of Americans approved Obama's overall handling of the economy, but 48% and 51% disapproved of his handling of the federal budget deficit and controlling federal spending, respectively. A CBS News poll taken August 27–31 showed 53% of those polled approved of his handling of the economy. A Rasmussen poll taken on November 12 found 45% of Americans rating Obama's handling of the economy as poor and 39% rating him as doing a good or excellent job. They found 72% of Democrats rated his handling of the economy as good or excellent, while only 10% of Republicans and 27% of voters not affiliated with either party agreed.

2010

On March 25, 2010, following his signing of landmark health care reform legislation into law, Obama's polling was revealed by Bloomberg to be 50%, with higher marks for relations with other countries (58%) and his running of the war in Afghanistan (54%). "Obama's approval rating is roughly equal to what Bill Clinton had at this point in his presidency, according to data maintained by Gallup (and) higher than the 45 percent Ronald Reagan recorded in April 1982" and more favorable than Democrats or Republicans office in 2010. They found Obama's approval rating was at 85% among Democrats, compared with 46% among independents and 11% among Republicans.

Fox News released the results of two polls on April 8–9, 2010. The first showed a drop in Obama's approval rating to 43%, with 48% disapproving. In that poll, Democrats approved of Obama's performance 80–12%, while independents disapproved 49–38%. The other poll, which concentrated on the economy, showed disapproval of Obama's handling of the economy by a 53–42% margin, with 62% saying they were dissatisfied with the handling of the federal deficit. According to a Gallup Poll released April 10, 2010, President Obama had a 45% approval rating, with 48% disapproving. In a poll from Rasmussen Reports, released April 10, 2010, 47% approved of the President's performance, while 53% disapproved.

2011

Obama's approval rating jumped to a high following the death of Osama Bin Laden on May 2, 2011. A GfK poll conducted May 5, 2011 found his approval rating to be 60%. During the debt ceiling debate in August 2011, Obama's approval rating dropped to the low-40s.

Major legislation

2009

January 29: Lilly Ledbetter Fair Pay Act

February 4: Children's Health Insurance Reauthorization Act

February 11: DTV Delay Act

February 17: American Recovery and Reinvestment Act

March 30: Omnibus Public Lands Management Act of 2009

April 21: Edward M. Kennedy Serve America Act

May 20: Fraud Enforcement and Recovery Act

May 20: Helping Families Save Their Homes Act of 2009

May 22: Credit Card Accountability, Responsibility, and Disclosure Act of 2009

June 22: Family Smoking Prevention and Tobacco Control Act

August 6: Cash For Clunkers Extension Act

October 22: Veterans Health Care Budget Reform and Transparency Act

October 28: Matthew Shepard and James Byrd Jr. Hate Crimes Prevention Act

October 28: National Defense Authorization Act for Fiscal Year 2010

October 30: Ryan White HIV/AIDS Treatment Extension Act

November 6: Worker, Homeownership, and Business Assistance Act of 2009

2010

January 27: Emergency Aid to American Survivors of Haiti Earthquake Act

March 4: Travel Promotion Act

March 18: Hiring Incentives to Restore Employment Act (HIRE Act)

March 23: Patient Protection and Affordable Care Act

March 30: Health Care and Education Reconciliation Act of 2010

May 5: Caregivers and Veterans Omnibus Health Services Act of 2010

May 17: Daniel Pearl Freedom of the Press Act

July 1: Comprehensive Iran Sanctions, Accountability, and Divestment Act

July 21: Dodd-Frank Wall Street Reform and Consumer Protection Act

July 22: Unemployment Compensation Extension Act of 2010

July 22: Improper Payments Elimination and Recovery Act of 2010

August 10: SPEECH Act of 2010

September 27: Small Business Jobs and Credit Act of 2010

December 9: Animal Crush Video Prohibition Act of 2010

December 13: Healthy, Hunger-Free Kids Act of 2010

December 17: Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010

December 22: Don't Ask, Don't Tell Repeal Act of 2010

2011

January 2: James Zadroga 9/11 Health and Compensation Act of 2010 () January 4: Food Safety and Modernization Act, ,

January 7: National Defense Authorization Act for Fiscal Year 2011

August 2: Budget Control Act of 2011

December 31: National Defense Authorization Act for Fiscal Year 2012

Personnel

Cabinet appointees

Twenty-two members of the Obama administration are either in the United States Cabinet (15) or are in positions considered to be Cabinet-level (7). The members of the Cabinet are the heads of the fifteen major departments (State, Defense, Justice, etc.), and the seven cabinet-level positions are the Vice President, White House Chief of Staff, Administrator of the Environmental Protection Agency, Director of the Office of Management and Budget, U.S. Trade Representative, Ambassador to the United Nations, and the Chair of the Council of Economic Advisers. Since Robert Gates was a member of the previous administration, his letter of resignation (a formality at the end of a President's term) was simply not accepted, and he did not need confirmation. On January 19, 2009, Senate Democratic leaders requested fifteen of the twenty positions to be ratified by unanimous consent, and seven gained unanimous confirmation by voice vote the next day: Ken Salazar, Steven Chu, Arne Duncan, Peter Orszag, Eric Shinseki, Tom Vilsack, and Janet Napolitano. On January 21, Obama presided over the swearing in of the seven unanimous nominees. Later that day, the Senate confirmed Hillary Clinton by a 94–2 vote. On January 22, several more confirmations were approved unanimously: Susan E. Rice, Ray LaHood, Lisa P. Jackson, and Shaun Donovan. On January 26, the Senate confirmed Geithner by a 60–34 margin.

At the conclusion of Obama's first week as President, Hilda Solis, Tom Daschle, Ron Kirk, and Eric Holder had yet to be confirmed, and there had been no second appointment for Secretary of Commerce. Holder was confirmed by a vote of 75–21 on February 2, and on February 3, Obama announced Senator Judd Gregg as his second nomination for Secretary of Commerce. Daschle withdrew later that day amid controversy over his failure to pay income taxes and potential conflicts of interest related to the speaking fees he accepted from health care interests. Solis was later confirmed by a vote of 80-17 on February 24, and Ron Kirk was confirmed on March 18 by a 92-5 vote in the Senate.

Gregg, who was the leading Republican negotiator and author of the TARP program in the Senate, after publication that he had a multi-million dollar investment in the Bank of America, on February 12, withdrew his nomination as Secretary of Commerce, citing "irresolvable conflicts" with President Obama and his staff over how to conduct the 2010 census and the American Recovery and Reinvestment Act of 2009. Former Washington governor Gary Locke was nominated on February 26 as Obama's third choice for Commerce Secretary and confirmed on March 24 by voice vote.

On March 2, Obama introduced Kansas governor Kathleen Sebelius as his second choice for Secretary of Health and Human Services. He also introduced Nancy-Ann DeParle as head of the new White House Office of Health Reform, which he suggested would work closely with the Department of Health and Human Services. At the end of March, Sebelius was the only remaining Cabinet member yet to be confirmed.

Six high-ranking cabinet nominees in the Obama administration had their confirmations delayed or rejected among reports that they did not pay all of their taxes, including Tom Daschle, Obama's original nominee for Health and Human Services Secretary, and Treasury Secretary Timothy Geithner. Though Geithner was confirmed, and Senator Max Baucus, chairman of the Senate Finance Committee, thought Daschle would have been confirmed, Daschle withdrew his nomination on February 3. Obama had nominated Nancy Killefer for the position of Chief Performance Officer, but Killefer also withdrew on February 3, citing unspecified problems with District of Columbia unemployment tax. A senior administration official said that Killefer's tax issues dealt with household help. Hilda Solis, Obama's nominee for Secretary of Labor, faced delayed confirmation hearings due to tax lien concerns pertaining to her husband's auto repair business, but she was later confirmed on February 24. While pundits puzzled over U.S. Trade Representative-designate Ron Kirk's failure to be confirmed by March 2009, it was reported on March 2 that Kirk owed over $10,000 in back taxes. Kirk agreed to pay them in exchange for Senate Finance Committee Chairman Max Baucus's aid in speeding up the confirmation process; he was later confirmed on March 18. On March 31, Kathleen Sebelius, Obama's nominee for Health and Human Services secretary, revealed in a letter to the Senate Finance Committee that her Certified Public Accountant found errors in her tax returns for years 2005-2007. She, along with her husband, paid more than $7,000 in back taxes, along with $878 in interest.

Notable non-Cabinet positions

Appointees serve at the pleasure of the President and were nominated by Barack Obama except as noted.

Chair of the Federal Deposit Insurance Corporation

*Sheila Bair¹ (2009–2011)

Special envoy for Afghanistan and Pakistan

*Richard Holbrooke (2009–2010)

*Marc Grossman (2011–present)

Assistant to the President for National Security Affairs

* Retired General James L. Jones (2009–2011)

* Thomas E. Donilon (2011–present)

Special envoy to the Middle East

* George J. Mitchell (2009–2011)

* David Hale (2011–present)

Director of the Federal Bureau of Investigation

* Robert Mueller² (2009–present)

Director of the Central Intelligence Agency

* Leon Panetta (2009–2011)

* Michael Morell (Acting-2011)

* David Petraeus (2011–present)

Chair of the Council of Economic Advisers

* Christina Romer (2009–2010)

* Austan Goolsbee (2010–2011)

* Alan Krueger (2011–present)

Chair of the Securities and Exchange Commission

* Mary Schapiro (2009–present)

Assistant to the President for Economic Policy and Director of National Economic Council

* Lawrence Summers (2009–2010)

* Gene Sperling (2011–present)

Chairman of the Economic Recovery Advisory Board

* Paul Volcker (2009–2011)

* ''Replaced by Council on Jobs and Competitiveness in 2011''

Chairperson of the Council on Jobs and Competitiveness

* Jeffrey R. Immelt (2011–present)

¹Appointed by George W. Bush in 2006 to a five-year term ²Appointed by George W. Bush in 2001 to a ten-year term

Judicial nominees

United States Supreme Court

Obama appointed the following Justices to the Supreme Court of the United States: Sonia Sotomayor 2009 Elena Kagan 2010

Other courts

Outside of the Supreme Court, by October 2009, Obama had nominated fewer than two dozen judges to fill judicial vacancies, of which there were close to 100. This has prompted some Democrats to criticize the pace of Obama's judicial appointments as too slow. In December 2009, Senator Patrick Leahy criticized Republicans for stalling those judicial nominations that had been made, noting that the Senate confirmed more district and circuit court nominees during the first year of the George W. Bush administration than it had approved by that point during the Barack Obama presidency.

As of July 2010, Obama's nominees to the district and circuit courts had been confirmed at a rate of only 43.5 percent, compared to 87.2 percent during Bill Clinton's administration and 91.3 percent for George W. Bush. The Center for American Progress, which compiled the data, commented:

Judicial confirmations slowed to a trickle on the day President Barack Obama took office. Filibusters, anonymous holds, and other obstructionary tactics have become the rule. Uncontroversial nominees wait months for a floor vote, and even district court nominees—low-ranking judges whose confirmations have never been controversial in the past—are routinely filibustered into oblivion. Nominations grind to a halt in many cases even after the Senate Judiciary Committee has unanimously endorsed a nominee.

Policies

Economy

Upon entering office, Obama planned to center his attention on handling the global financial crisis. Even before his inauguration he lobbied Congress to pass an economic stimulus bill, which became the top priority during his first month in office. As President, Obama made a high profile trip to Capitol Hill, Washington, D.C. to dialog with Congressional Republicans and advocate for the bill. On February 17, 2009, Obama signed into law a $787 billion plan that included spending for health care, infrastructure, education, various tax breaks and incentives, and direct assistance to individuals. The tax provisions of the law reduced taxes for 98 per cent of taxpayers, bringing tax rates to their lowest levels in 60 years.

As part of the 2010 budget proposal, the Obama administration has proposed additional measures to attempt to stabilize the economy, including a $2–3 trillion measure aimed at stabilizing the financial system and freeing up credit. The program includes up to $1 trillion to buy toxic bank assets, an additional $1 trillion to expand a federal consumer loan program, and the $350 billion left in the Troubled Assets Relief Program. The plan also includes $50 billion intended to slow the wave of mortgage foreclosures. The 2011 budget includes a three-year freeze on discretionary spending, proposes several program cancellations, and raises taxes on high income earners to bring down deficits during the economic recovery.

In a July 2009 interview with ABC News, Biden was asked about the sustained increase of the U.S. unemployment rate from May 2007 to October 2009 despite the administration's multi-year economic stimulus package passed five months earlier. He responded "The truth is, we and everyone else, misread the economy. The figures we worked off of in January were the consensus figures and most of the blue chip indexes out there ... the truth is, there was a misreading of just how bad an economy we inherited." The White House indicates that 2 million jobs were created or saved due to the stimulus package in 2009 and self reporting by recipients of the grants, loans, and contracts portion of the package report that the package saved or created 608,317 jobs in the final three months of 2009.

The unemployment rate rose in 2009, reaching a peak in October at 10.1% and averaging 10.0% in the fourth quarter. Following a decrease to 9.7% in the first quarter of 2010, the unemployment rate fell to 9.6% in the second quarter, where it remained for the rest of the year. Between February and December 2010, employment rose by 0.8%, which was less than the average of 1.9% experienced during comparable periods in the past four employment recoveries. GDP growth returned in the third quarter of 2009, expanding at a 1.6% pace, followed by a 5.0% increase in the fourth quarter. Growth continued in 2010, posting an increase of 3.7% in the first quarter, with lesser gains throughout the rest of the year. Overall, the economy expanded at a rate of 2.9% in 2010.

During November–December 2010, Obama and a lame duck session of the 111th Congress focused on a dispute about the temporary Bush tax cuts, which were due to expire at the end of the year. Obama wanted to extend the tax cuts for taxpayers making less than $250,000 a year. Congressional Republicans agreed but also wanted to extend the tax cuts for those making over that amount, and refused to support any bill that did not do so. All the Republicans in the Senate also joined in saying that, until the tax dispute was resolved, they would filibuster to prevent consideration of any other legislation, except for bills to fund the U.S. government. On 7 December, Obama strongly defended a compromise agreement he had reached with the Republican congressional leadership that included a two-year extension of all the tax cuts, a 13-month extension of unemployment insurance, a one-year reduction in the FICA payroll tax, and other measures. On December 10, Senator Bernie Sanders (I-VT) led a filibuster against the compromise tax proposal, which lasted over eight hours. Obama persuaded many wary Democrats to support the bill, but not all; of the 148 votes against the bill in the House, 112 were cast by Democrats and only 36 by Republicans. The $858 billion Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010, which ''The Washington Post'' called "the most significant tax bill in nearly a decade", passed with bipartisan majorities in both houses of Congress and was signed into law by Obama on December 17, 2010.

Ethics

Lobbying reform

Early in his presidential campaign, Obama stated that "they [lobbyists] won't find a job in my White House", but softened his stance later in the campaign. On January 21, 2009, Obama issued an executive order for all future appointees to his administration, which stated, no appointee who was a registered lobbyist within the two years before his appointment could participate on matters in which he lobbied for a period of two years after the date of appointment. Three formal waivers were initially issued in early 2009, out of 800 executive appointments: to William J. Lynn III, a lobbyist for Raytheon, to hold the position of Deputy Secretary of Defense; to Jocelyn Frye, former general counsel at the National Partnership for Women and Families, to serve as Director of Policy and Projects in the Office of the First Lady; and to Cecilia Muñoz, former senior vice president for the National Council of La Raza, to serve as Director of Intergovernmental Affairs in the Executive Office of the President. As of March 21, 2009, at least thirty officials appointed by Obama had been lobbyists in the past five years. Ten additional waivers were announced in September 2009.

Not all recent former lobbyists require waivers; those without waivers write letters of recusal stating issues from which they must refrain because of their previous jobs. ''USA Today'' reported that 21 members of the Obama administration have at some time been registered as federal lobbyists, although most have not within the previous two years. Lobbyists in the administration include William Corr, an anti-tobacco lobbyist, as Deputy Secretary of Health and Human Services and Tom Vilsack, who lobbied in 2007, for a national teachers union, as Secretary of Agriculture. Also, the Secretary of Labor nominee, Hilda Solis, formerly served as a board member of American Rights at Work, which lobbied Congress on two bills Solis co-sponsored, and Mark Patterson, Treasury Secretary Timothy Geithner's chief of staff, is a former lobbyist for Goldman Sachs.

The Citizens for Responsibility and Ethics in Washington have criticized the administration, claiming that Obama is retreating from his own ethics rules barring lobbyists from working on the issues about which they lobbied during the previous two years by issuing waivers. According to Melanie Sloan, the group's executive director, "It makes it appear that they are saying one thing and doing another."

Transparency

The Obama administration has said that all executive orders, non-emergency legislation, and proclamations will be posted to the official White House website, whitehouse.gov, allowing the public to review and comment for five days before the President signs the legislation. The pledge was twice broken during Obama's first month in office when he signed SCHIP legislation and the Lilly Ledbetter Fair Pay Act with less than the full five days of "sunlight before signing". The administration has said that they are still "working through implementation procedures and some initial issues with the congressional calendar".

During his first week in office, Obama announced plans to post a video address each week on the site, and on YouTube, informing the public of government actions each week. During his speech at the 2008 Democratic National Convention, Obama stated, "I will also go through the federal budget, line by line, eliminating programs that no longer work and making the ones we do need work better and cost less - because we cannot meet twenty-first century challenges with a twentieth century bureaucracy."

On January 21, 2009, by executive order, Obama revoked Executive Order 13233, which had limited access to the records of former United States Presidents. Obama issued instructions to all agencies and departments in his administration to "adopt a presumption in favor" of Freedom of Information Act requests. In April 2009, the United States Department of Justice released four legal memos from the Bush administration to comply voluntarily with a Freedom of Information Act lawsuit filed by the American Civil Liberties Union. The memos were written by John Yoo and signed by Jay Bybee and Steven Bradbury, then Principal Assistant Attorneys General to the Department of Justice, and addressed to John A. Rizzo, general counsel of the Central Intelligence Agency. The memos describe in detail controversial interrogation methods the CIA used on prisoners suspected of terrorism. Obama became personally involved in the decision to release the memos, which was opposed by former CIA directors Michael Hayden, Porter Goss, George Tenet and John Deutch. Former Vice President Dick Cheney criticized Obama for not releasing more memos; Cheney claimed that unreleased memos detail successes of CIA interrogations.

The American Recovery and Reinvestment Act requires all recipients of the funds provided by the act to publish a plan for using the funds, along with purpose, cost, rationale, net job creation, and contact information about the plan to a website Recovery.gov so that the public can review and comment. Inspectors General from each department or executive agency will then review, as appropriate, any concerns raised by the public. Any findings of an Inspector General must be relayed immediately to the head of each department and published on Recovery.gov.

On June 16, 2009, Citizens for Responsibility and Ethics in Washington (CREW) filed a lawsuit against the Obama administration in order to get information about the visits of coal company executives. Anne Weismann, the chief counsel for CREW, stated "The Obama administration has now taken exactly the same position as the Bush administration... I don't see how you can keep people from knowing who visits the White House and adhere to a policy of openness and transparency." On June 16, MSNBC reported that its more comprehensive request for visitor logs since Obama's January 20 inauguration had been denied. The administration announced that White House visitor logs will be made available to the public on an ongoing basis, with certain limitations, for visits occurring after September 15, 2009. Beginning on January 29, 2010, the White House did begin to release the names of its visitor records. Since that time, names of visitors (which includes not only tourists, but also names of union leaders, Wall Street executives, lobbyists, party chairs, philanthropists and celebrities), have been released. The names are released in huge batches up to 75,000 names at a time. Names are released 90–120 days after having visited the White House. The complete list of names is available online by accessing the official White House website.

Obama stated during the 2008 Presidential campaign that he would have negotiations for health care reform televised on C-SPAN, citing transparency as being the leverage needed to ensure that people stay involved in the process taking place in Washington. This did not fully happen and Politifact gives President Obama a "Promise Broken" rating on this issue. After White House press secretary Robert Gibbs initially avoided addressing the issue, President Obama himself acknowledged that he met with Democratic leaders behind closed doors to discuss how best to garner enough votes in order to merge the two (House and Senate) passed versions of the health care bill. Doing this violated the letter of the pledge, although Obama maintains that negotiations in several congressional committees were open, televised hearings. Obama also cited an independent ethics watchdog group describe his administration as the most transparent in recent history.

The Obama administration has been characterized as much more aggressive than the Bush and other previous administrations in their response to whistleblowing and leaks to the press. Three people have been prosecuted under the rarely used Espionage Act of 1917. They include Thomas Andrews Drake, a former National Security Agency (NSA) employee who was critical of the NSA's Trailblazer Project, Stephen Jin-Woo Kim, a State Department contractor who allegedly had a conversation about North Korea with James Rosen of Fox News, and Jeffrey Sterling, who allegedly was a source for James Risen's book State of War. Risen has also been subpoenaed to reveal his sources, another rare action by the government.

Foreign policy

In his inaugural address, Obama suggested that he plans to begin the process of withdrawing from Iraq and continuing to focus on the war in Afghanistan. He also mentioned lessening the nuclear threat through "working tirelessly with old friends and former foes". He spoke about America's determination to combat terrorism, proclaiming America's spirit is "stronger and cannot be broken — you cannot outlast us, and we will defeat you." To the Muslim world, Obama extended an invite to "a new way forward, based on mutual interest and mutual respect". He also said the USA would "extend a hand" to those "who cling to power through corruption and deceit" if they "are willing to unclench" their fists. Shortly after his inauguration President Obama first called President Abbas of the Palestinian National Authority (PNA). Calls were also made to President Mubarak of Egypt, Prime Minister Olmert of Israel and King Abdullah of Jordan. Obama and Secretary of State Hillary Clinton named George Mitchell as Special Envoy for Middle East peace and Richard Holbrooke as special representative to Pakistan and Afghanistan on January 23, 2009. At the same time, Obama called on Israel to open the borders of Gaza, detailing early plans on his administration's peace plans for the Israeli–Palestinian conflict. On February 18, 2009, Obama announced that the U.S. military presence in Afghanistan would be bolstered by 17,000 new troops by summer. The announcement followed the recommendation of several experts including Defense Secretary Robert Gates that additional troops be deployed to the war-torn nation.

Obama declared his plan for ending the Iraq War on February 27, 2009, in a speech at Camp Lejeune, North Carolina, before an audience of Marines stationed there. According to the president, combat troops will be withdrawn from Iraq by August 2010, leaving a contingent of up to 50,000 servicemen and servicewomen to continue training, advisory, and counterterrorism operations until as late as the end of 2011.

Other characteristics of the Obama administration on foreign policy include a tough stance on tax havens, continuing military operation in Pakistan, and avowed focus on diplomacy to prevent nuclear proliferation in Iran and North Korea.

On April 1, 2009, Obama and China's President, Hu Jintao, announced the establishment of the U.S.-China Strategic and Economic Dialogue and agreed to work together to build a positive, cooperative, and comprehensive U.S.-China relationship for the 21st century.

In that same month, Obama requested that Congress approve $83.4 billion of supplemental military funding, mostly for the war in Iraq and to increase troop levels in Afghanistan. The request also includes $2.2 billion to increase the size of the US military, $350 million to upgrade security along the US-Mexico border, and $400 million in counterinsurgency aid for Pakistan.

In May 2009, it was reported that Obama plans to expand the military by 20,000 employees.

On June 4, 2009, Obama delivered a speech at Cairo University in Egypt. The wide ranging speech called for a "new beginning" in relations between the Islamic world and the United States. The speech received both praise and criticism from leaders in the region. In March 2010, Secretary of State Clinton criticized the Israeli government for approving expansion of settlements in East Jerusalem.

On April 8, 2010, Obama and Russian President Dmitry Medvedev signed the latest Strategic Arms Reduction Treaty (START), a "major" nuclear arms control agreement that reduces the nuclear weapons stockpiles of both countries.

In March 2011, international reaction to Muammar Gaddafi's military crackdown on rebel forces and civilians in Libya culminated in a United Nations resolution to enforce a no fly zone in Libya. Obama authorized U.S. forces to participate in international air attacks on Libyan air defenses using Tomahawk cruise missiles to establish the protective zone.

Guantánamo Bay detention camp

On his first day in office, Obama requested a 120-day suspension of all trials for alleged terrorists held at the Guantánamo Bay detention camp, so the new administration could "review the military commissions process, generally, and the cases pending before military commissions , specifically". Another order established a task force to lead a review of detention policies, procedures and individual cases. Obama addressed the State Department that "the United States will not torture" and drafted an executive order to close Guantánamo within a year. On January 22, 2009, Obama signed an executive order ensuring safe, lawful, and humane treatment of individuals detained in armed conflicts. This order restricts interrogators to methods listed and authorized by an Army Field Manual. A detainee released since Obama took office claimed in an interview with Agence France-Presse that conditions at Guantánamo had worsened, stating guards wanted to "take their last revenge" before the facility is closed. On March 13, 2009, the administration announced that it would no longer refer to prisoners at Guantánamo Bay as enemy combatants, but it also asserted that the president has the authority to detain terrorism suspects there without criminal charges.

The case review of detainee files by administration officials and prosecutors was made more difficult than expected as the Bush administration had failed to establish a coherent repository of the evidence and intelligence on each prisoner. By September 2009, prosecutors recommended to the Justice Department which detainees are eligible for trial, and the Justice Department and the Pentagon worked together to determine which of several now-scheduled trials will go forward in military tribunals and which in civilian courts. While 216 international terrorists are already held in maximum security prisons in the U.S., Congress was denying the administration funds to shut down the camp and adapt existing facilities elsewhere, arguing that the decision was "too dangerous to rush". In November, Obama stated that the U.S. would miss the January 2010 date for closing the Guantánamo Bay prison as he had ordered, acknowledging that he "knew this was going to be hard". Obama did not set a specific new deadline for closing the camp, citing that the delay was due to politics and lack of congressional cooperation. The state of Illinois has offered to sell to the federal government the Thomson Correctional Center, a new but largely unused prison, for the purpose of housing detainees. Federal officials testified at a December 23 hearing that if the state commission approves the sale for that purpose, it could take more than six months to ready the facility.

Killing of Osama bin Laden

Starting with information received in July 2010, intelligence developed by the CIA over the next several months determined what they believed to be the location of Osama bin Laden in a large compound in Abbottabad, Pakistan, a suburban area 35 miles from Islamabad. CIA head Leon Panetta reported this intelligence to Obama in March 2011. Meeting with his national security advisers over the course of the next six weeks, Obama rejected a plan to bomb the compound, and authorized a "surgical raid" to be conducted by United States Navy SEALs. The operation took place on May 1, 2011, resulting in the death of bin Laden and the seizure of papers and computer drives and disks from the compound. Bin Laden's body was identified through DNA testing, and buried at sea several hours later. Within minutes of Obama's announcement from Washington, DC, late in the evening on May 1, there were spontaneous celebrations around the country as crowds gathered outside the White House, and at New York City's Ground Zero and Times Square. Reaction to the announcement was positive across party lines, including from predecessors George W. Bush and Bill Clinton, and from many countries around the world.

Overseas Contingency Operation

Obama discontinued use of the term "War on Terror" and instead uses the term "Overseas Contingency Operation". However, Obama has stated that the U.S. is at war with Al-Qaeda, saying "Our nation is at war, against a far-reaching network of violence and hatred."

In April 2010, the Obama administration took the extraordinary step of authorizing the targeted killing of an American citizen, the radical Muslim cleric Anwar al-Awlaki, who was believed to have shifted from encouraging attacks on the United States to directly participating in them.

Gun control

During the presidential campaign, Obama announced that he favors measures that respect Second Amendment rights, while at the same time keeping guns away from children and criminals. On February 25, 2009, Attorney General Eric Holder announced that the Obama administration would seek a new assault weapons ban across the United States, saying that it would have a positive impact on the drug-related violence in Mexico. After the statement drew criticism from the NRA and some House Democrats, the Administration reportedly ordered the Justice Department to end public discussion of the issue. Obama has signed into law two bills containing amendments reducing restrictions on gun owners, one which permits guns to be transported in checked baggage on Amtrak trains and another which allows carrying loaded firearms in national parks located in states allowing concealed carry.

Science and technology

Cybersecurity

Obama initiated a 60-day review of cybersecurity by Melissa Hathaway, a consultant for Booz Allen Hamilton, appointed Acting Senior Director for Cyberspace.

''The New York Times'' reported in 2009, that the NSA is intercepting communications of American citizens including a Congressman, although the Justice Department believed that the NSA had corrected its errors. United States Attorney General Eric Holder resumed the wiretapping according to his understanding of the Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008 that Congress passed in July 2008, but without explaining what had occurred.

Environment

On January 27, 2009, Obama issued two presidential memoranda concerning energy policy. One directed the Department of Transportation to raise fuel efficiency standards incrementally to by 2020, and the other directed the Environmental Protection Agency to allow individual states to set stricter tailpipe emissions regulations than the federal standard.

The American Recovery and Reinvestment Act of 2009 provides $54 billion in funds to double domestic renewable energy production, renovate federal buildings making them more energy-efficient, improve the nation's electricity grid, repair public housing, and weatherize modest-income homes.

On February 10, 2009, Obama overturned a Bush administration policy that had opened up a five-year period of offshore drilling for oil and gas near both the Atlantic and Pacific coasts. Interior Secretary Ken Salazar has been quoted as saying, "To establish an orderly process that allows us to make wise decisions based on sound information, we need to set aside" the plan "and create our own timeline".

On May 19, 2009, Obama announced a plan to increase the CAFE national standards for gasoline mileage, by creating a single new national standard that will create a car and light truck fleet in the United States that is almost 40 percent cleaner and more fuel-efficient by 2016, than it is today, with an average of 35.5 miles per gallon. Environmental advocates and industry officials welcomed the new program, but for different reasons. Environmentalists called it a long-overdue tightening of emissions and fuel economy standards after decades of government delay and industry opposition. Auto industry officials said it would provide the single national efficiency standard they have long desired, a reasonable timetable to meet it and the certainty they need to proceed with product development plans.

On March 30, 2010, Obama partially reinstated Bush administration proposals to open certain offshore areas along the Atlantic coastline, the eastern Gulf of Mexico and the north coast of Alaska to oil and natural gas drilling. The proposals had earlier been set aside by President Obama after they were challenged in court on environmental grounds.

On May 27, 2010, Obama extended a moratorium on offshore drilling permits after the April 20, 2010 Deepwater Horizon oil spill which is considered to be the worst oil spill in U.S. history. Although BP took responsibility for the disaster and its ongoing after effects, Obama began a federal investigation along with forming a bipartisan commission to review the incident and methods to avoid it in the future. Obama visited the Gulf Coast on May 2 and May 28 and expressed his frustration on the June 8 ''NBC Today Show'', by saying "I don't sit around just talking to experts because this is a college seminar. We talk to these folks because they potentially have the best answers, so I know whose ass to kick." Obama's response to the disaster has drawn confusion and criticism within segments of the media and public.

NASA

Obama set up the Augustine panel to review the Constellation program in 2009, and announced in February 2010, that he was cutting the program from the 2011 United States federal budget, describing it as "over budget, behind schedule, and lacking in innovation." After the decision drew criticism in the United States, a new "Flexible path to Mars" plan was unveiled at a space conference in April 2010. It included new technology programs, increased R&D spending, a focus on the International Space Station and contracting out flying crew to space to commercial providers. The new plan also increased NASA's 2011 budget to $19 billion from $18.3 billion in 2010.

In July 2009, Obama appointed Charles Bolden, a former astronaut, to be administrator of NASA.

Stem cell research

On March 9, 2009, Obama repealed a Bush-era policy that prevented federal tax dollars from being used to fund research on new lines of embryonic stem cells. Such research has been a matter of debate between those who emphasize the therapeutic potential of such research and those who suggest that elements of this research breach ethical limitations. Obama stated that "In recent years, when it comes to stem cell research, rather than furthering discovery, our government has forced what I believe is a false choice between sound science and moral values...In this case, I believe the two are not inconsistent. As a person of faith, I believe we are called to care for each other and work to ease human suffering. I believe we have been given the capacity and will to pursue this research — and the humanity and conscience to do so responsibly."

Social policy

On January 23, 2009, Obama rescinded the Mexico City Policy, a measure from the Reagan and Bush eras that required any non-governmental organization receiving U.S. Government funding to refrain from performing or promoting abortion services in other countries.

On June 17, 2009, Obama authorized the extension of some benefits (but not health insurance or pension benefits) to same-sex partners of federal employees. Obama has chosen to leave larger changes, such as the repeal of Don't ask, don't tell and the Defense of Marriage Act, to Congress.

On October 19, 2009, the U.S. Department of Justice issued a directive to federal prosecutors in states with medical marijuana laws not to investigate or prosecute cases of marijuana use or production done in compliance with those laws.

On December 16, 2009, President Obama signed the Consolidated Appropriations Act, 2010, which repealed a 21-year-old ban on federal funding of needle exchange programs.

On December 22, 2010, Obama signed the Don't Ask, Don't Tell Repeal Act of 2010, a bill that provides for repeal of the Don't ask, don't tell policy of 1993, that has prevented gay and lesbian people from serving openly in the United States Armed Forces. Repealing "Don't ask, don't tell" had been a key campaign promise that Obama had made during the 2008 presidential campaign.

Health care reform

Once the stimulus bill was enacted, health care reform became Obama's top domestic priority. On July 14, 2009, House Democratic leaders introduced a 1,000 page plan for overhauling the US health care system, which Obama wanted Congress to approve by the end of the year.

The U.S. Congressional Budget Office (CBO) estimated the ten-year cost to the federal government of the major insurance-related provisions of the bill at approximately $1.0 trillion. In mid-July 2009, Douglas Elmendorf, director of the CBO, testified that the proposals under consideration would significantly increase federal spending and did not include the "fundamental changes" needed to control the rapid growth in health care spending. However after reviewing the final version of the bill introduced after 14 months of debate the CBO estimated that it would reduce federal budget deficits by $143 billion over 10 years and by more than a trillion in the next decade.

After much public debate during the Congressional summer recess of 2009, Obama delivered a speech to a joint session of Congress on September 9 where he addressed concerns over his administration's proposals. In March 2010, Obama gave several speeches across the country to argue for the passage of health care reform. On March 21, 2010, after Obama announced an executive order reinforcing the current law against spending federal funds for elective abortion services, the House, by a vote of 219 to 212, passed the version of the bill previously passed on December 24, 2009, by a 60-vote supermajority in the Senate. The bill, which includes over 200 Republican amendments, was passed without a single Republican vote. On March 23, 2010, President Obama signed the bill into law. Immediately following the bill's passage, the House voted in favor of a reconciliation measure to make significant changes and corrections to the Patient Protection and Affordable Care Act, which was passed by both houses with two minor alterations on March 25, 2010, and signed into law on March 30, 2010.

Education reform

On March 30, 2010, Obama signed the Health Care and Education Reconciliation Act of 2010, which ended the role of private banks in lending out federally-insured student loans. By directly lending to students, the government is projected to save taxpayers $68 billion dollars over the next several years. Federally-insured student loans will instead be distributed by the Department of Education. The law also increased the amount of Pell Grant awards given each year, doubling its current funding. Starting in 2014, the law permits borrowers to cap the amount they spend on student loans each year to ten percent of their discretionary income and have their balance forgiven if they have faithfully paid the balance of their loan over 20 years. Additionally, the law seeks to make it easier for parents to qualify for Grad PLUS loans, and spends billions on poor and minority schools and $2 billion for community colleges.

Gates arrest controversy

On July 16, 2009, prominent African American Harvard University professor Henry Louis Gates, Jr., was arrested at his Cambridge, Massachusetts home by a local white police officer, Cambridge Police Sgt. James Crowley, for disorderly conduct. Gates, who was locked out of his house, had attempted to break into his own property, thus causing the initial alarm from a neighbor who called 9-1-1. The incident sparked national controversy over whether Gates's civil rights had been violated by Crowley. On July 21, the Cambridge Police Department dropped charges against Gates. On July 22, President Barack Obama, commented on the incident over national and international television, criticized the arrest, and stated the police acted "stupidly" in handling the incident. National law enforcement organizations and members objected to Obama's comments and criticized his handling of the issue. In the aftermath, Obama stated that he regretted his comments exacerbating the situation, and hoped that the situation could become a "teachable moment". To reduce tensions, on July 24, Obama invited both parties to the White House to discuss the issue over beers, and on July 30, Obama and Vice President Joe Biden joined Crowley and Gates in a private, cordial meeting in a courtyard near the White House Rose Garden; this became known colloquially as the "Beer Summit".

Wall Street reform

On July 21, 2010, Obama signed Dodd–Frank Wall Street Reform and Consumer Protection Act, considered to be the largest financial system overhaul since the New Deal. The law recognizes complex financial derivatives and makes rules to protect consumers from unfair practices in loans and credit cards by establishing a new consumer protection agency. At the signing ceremony in the Ronald Reagan Building in Washington D.C. Obama proclaimed, "There will be no more taxpayer-funded bailouts. Period." Obama also mentioned that "These reforms represent the strongest consumer financial protections in history." At the ceremony were Sen. Christopher Dodd, D-Conn., and Rep. Barney Frank, D-Mass., the two committee chairmen who sponsored the bill.

2010 midterm elections

Due in large part to voter frustration over high unemployment and a stalled economy, Republicans won control of the House in the 2010 midterm elections. On reflection after the election, Obama blamed himself, in part, for the many Democrats who went down to defeat knowing that they had risked their careers to support his agenda of economic stimulus legislation and a landmark health care bill. Democrats narrowly retained the Senate majority and will continue to control it through the 112th Congress.

Obama called the elections "humbling" and a "shellacking". He said that the results came because not enough Americans had felt the effects of the economic recovery.

2012 re-election campaign

On April 4, 2011, President Obama announced that he would seek re-election in the 2012 presidential election. The campaign will be based in Chicago and is being run by many former members of the White House staff and members of the successful 2008 campaign.

References

External links

"Obama's People" (photography: Nadav Kander)

The Official White House YouTube page

"President Barack Obama's Inaugural Address". The White House.

"Wrapping Up Open for Questions". The White House.

"President Obama's State of the Union Address" C-SPAN.

Obama, Barack

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