FactCheck.org
FactCheck.org is a nonprofit website[1] that describes its own goal as "[reducing] the level of deception and confusion in U.S. politics." In its efforts, FactCheck claims it is nonpartisan.[2] It is a project of the Annenberg Public Policy Center of the Annenberg School for Communication at the University of Pennsylvania, and is funded primarily by the Annenberg Foundation.[2]
Most of its content consists of rebuttals to what it considers inaccurate, misleading, or false claims by politicians. FactCheck has also targeted the misleading claims from various partisan groups.