Annenberg Public Policy Center site that monitors the factual accuracy of what is said by major U.S. political players in the form of TV ads, debates, speeches, interviews and news releases.
PolitiFact is a fact-checking website that rates the accuracy of claims by elected officials and others who speak up in American politics with its "truth-o-meter.
The Snopes.com web site was founded by David Mikkelson, a project begun in 1994 as an expression of his interest in researching urban legends that has since grown into the oldest and largest fact-checking site on the Internet.