ICPSR is an international consortium of more than 700 colleges, universities, and research organizations. Hosted by the University of Michigan, it includes data archives, research statistics, and educational activities on various political and social topics.

The Federal Register, "the main source for the U.S. federal government agencies to propose new rules and regulations, announce final rules and changes to existing rules, and notify the public of meetings and adjudicatory proceedings," is an essential part of U.S. politics but can be difficult to comprehend or search. GovPulse makes the Federal Register's documents searchable and much easier to access and understand.

"As the only Washington, DC-based think tank that actively promotes bipartisanship, BPC works to address the key challenges facing the nation. Our policy solutions are the product of informed deliberations by former elected and appointed officials, business and labor leaders, and academics and advocates who represent both ends of the political spectrum. We are currently focused on health care, energy, national and homeland security, transportation and the economy."

The Pew Research Center’s Social & Demographic Trends project studies behaviors and attitudes of Americans in key realms of their lives, including family, community, health, finance, work and leisure. The project explores these topics by combining original public opinion survey research with social, economic and demographic data analysis.

This independent agency works for Congress to "help improve the performance and ensure the accountability of the federal government for the benefit of the American people." Includes reports on a variety of topics.

ANES has been examining the American electorate since 1948. Data-sets on citizens' attitudes surrounding U.S. elections are available for download, as well as "at-a-glance" statistics on various demographic measures and public attitudes.

The Federal Election Commission's database of disclosed campaign finance data. Searchable by donor, committee, and candidate.

Based out of the Annenberg Public Policy Center, this site examines claims made in political ads, campaign statements, interviews, etc. for accuracy and corrects incorrect information.

Regularly breaks down electoral trends and runs statistical projections on various public polls to predict electoral outcomes in the presidential race. The authors are avowed Democrats, but claim non-partisanship in their calculation methods.

Culled from candidates' campaign finance reports, this databases breaks down contributions, lobbyists, interests, industry giving patterns, and more. Invaluable for local political issues.

One of the premier public polling organizations in the U.S. Covers electoral issues as well as national topics of interest.

A California-based non-profit that tracks the connections between lobbyists, campaign contributors, legislators, and bills. Connecting data displayed in charts and graphs. A deep, rich resource, but remember to check the sources!

A nonpartisan organization tracking political contributions by individuals, various types of political action groups, and lobbyists. Tracks minute local data on donors, and provides information on contribution trends within specific industries.

One of the best sites compiling polling in various U.S. political contests.

A nonprofit organization tracking and compiling information about political candidates, sitting politicians, and interest groups. Information can include contact information, voting records, public statements, and Vote Smart's "political courage test."

Pulls together a host of media content on politics, from OP/ED pieces and prominent blogs to overviews of various national and state polls.

Interactive visualization of historical voting trends in U.S. presidential elections from 1840-. A variety of metrics, including turnout, voting by party, margins of victory, etc. are available.