- FactCheck.org: A nonpartisan project from the Annenberg Public Policy Center dedicated to reducing deception in U.S. politics by fact-checking statements made by political figures.
- PolitiFact: A Pulitzer Prize-winning site that rates the accuracy of claims by elected officials, political candidates, and pundits. It uses a "Truth-O-Meter" to assess statements from true to false.
- OpenSecrets.org: Provides transparency around political campaign financing, including candidate donations and spending by political action committees (PACs).
