FactCheck.org
A project of the University of Pennsylvania's Annenberg Public Policy Center.
 

OpenSecrets.org
The Center for Responsive Politics is a nonpartisan nonprofit organization. The website tracks money in U.S. politics and its effect on elections and public policy.
 

PolitiFact
A project of the Tampa Bay Times

Vote Smart
Provides information on candidates for political office, legislation, and the judicial branch.
 

Washington Post: The Fact Checker
Fact checking on Congress, the President, recent elections, and more.

New York Times: Fact Checks
 

Political TV Ad Archive
From the Internet Archive
 

American Press Institute's Fact Checking Resources
Vetted resources for fact checkers
 

Duke Reporter's Lab
Fact checking news and links to global fact checking sites
 

Center for Public Integrity
News about ethics, campaign donations, lobbying and influence in government.