CNN's collection of election related data.

A Blog edited by Nate Silver, uses advanced polling methodologies for political analysis.

From it's founding in 2006, HuffPost Pollster (originally Pollster.com) has aimed to report the results of every public poll that claims to provide a representative sample of the population or electorate. Their criteria have always been expansive — they have included polls of varying methodology, including automated, recorded voice telephone polls and online surveys using non-probability internet samples.

A selection of polling including national, local, electoral and approval.

An archive of social science data for research and instruction in the social sciences, education, health sciences, and business. Read the information carefully before downloading data sets from ICPSR or placing requests with Research Computing.

The American National Election Studies produces data on voting, public opinion, and political participation to serve the research needs of social scientists, teachers, students, policy makers and journalists.

Since 1920, the Clerk of the House has collected and published the official vote counts for federal elections from the official sources among the various states and territories.

Statistics from recent elections are available in scanned image (Adobe Acrobat .PDF) format. Please note that printing a whole document may take a long time.

The Pew Research Center is a nonpartisan "fact tank" that provides information on the issues, attitudes and trends shaping America and the world. It does not take positions on policy issues.

This Center, one of Pew's eight, explores public attitudes about the credibility, social value and salience of the news media. There is frequent overlap into areas related and responding to political campaigning.

Pollster tracks, aggregates, and analyzes political polls. This independently published site also links to other polling and survey research groups, and provides a FAQ page explaining how political polling is done.