Free online encyclopedia, started in 2007 & continually updated, covering all aspects of US politics. Aims for content to be neutral, objective and verifiable

cable TV project to provide free access to Congressional debates (some back to 1983) & other video content on US government, including presidential debates

See also: Congress.gov; Congressional Research Service; C-Span Video Library; GovTrack

Official website for US federal legislative information, maintained by the Library of Congress (replaces Thomas)

Official Congress website for non-confidential CRS reports, an extremely useful source of information for US politics. Mostly recent, but older reports are being archived

Portal, curated by Stanford University, aims to facilitate more comprehensive access to CRS reports

Official portal to US government publications (replaces FD Sys & GPO Access). Freely accessible from about 1993 onwards, including Presidential documents, Congressional bills, documents, hearings & reports, the Congressional record, and Federal register. Also:
MetaLib from GPO - searches across official databases for reports, articles & citations, with links to full text.

tracking the US Congress, including complete voting records since the 1st Congress

GPO engine that cross searches official federal databases for reports, articles and citations. Links to full text

Repository for federal documents, some available digitally

Official government portal for searching federal & state websites, including list of federal agencies.

An independent US-based body focusing on US foreign policy, and publisher of the influential journal Foreign Affairs.

Official records of the foreign policy and diplomatic history of the US from 1945 to 1988 (publication is ongoing). Older volumes are also available for the period 1861-1960 from University of Wisconsin-Madison Libraries. See also:
Secretaries of Defense historical series of freely available publications online (1947-)
United States Treaty Series - digitised multilateral & bilateral treaties 1776-1949 on Library of Congress website (and its U.S. Treaties : a beginner's guide)

Provide online access to key declassified records on issues including U.S. national security, foreign policy, diplomatic and military history, and intelligence policy.

An independent, non-partisan, national institution established and funded by Congress. Full text of many reports are available.

Part of the larger JSTOR Reveal Digital project, providing open access to rare primary source material expressing Right-wing opinions in 1960s & 1970s America

Longstanding project (1999) based at UCSB, now containing over 100 000 documents relating to the presidency.

Debates from 1976 (+1960) with transcripts. Searchable by keyword

Film archive of presidential campaign commercials, 1952-2012.

Compiled by the National Archives and Records Administration (NARA), papers from 1929 (Herbert Hoover) to 1991 (George H.W. Bush) are available digitally through GPO digitization

Major independent think tank. Full text of many reports available.

Research centre at Rutgers with dataset on women who have held office at the congressional, statewide elected executive, and state legislative levels nationwide (1893-)

Independent database aiming to reveal the links between money and politics in the US.

Website from Center for Responsive Politics, looking at connections between money & politics in the US

Respected research institute, seeking to bring academia & public policy together on questions of domestic and international interest.

Portal to resources for Canadian politics, especially official sources such as the Cabinet Conclusions database.