FactCheck.org

An excellent site for comparing the claims of politicians against reality. They equally call out people on the left and the right when they have their facts wrong.

OpenSecrets.org

OpenSecrets.org is your nonpartisan guide to money’s influence on U.S. elections and public policy. Whether you’re a voter, journalist, activist, student or interested citizen, use this free site to shine light on your government.

OpenCongress.org

OpenCongress is a free, open-source, not-for-profit, and non-partisan web resource with a mission to make Congress more transparent and to encourage civic engagement.