The RaceTracker project on the OpenCongress wiki tracks every election for the U.S. Senate, U.S. House of Representatives and state governor.
Project Vote Smart
Project Vote Smart (PVS) is a citizen's organization dedicated to serving all Americans with accurate and unbiased information for electoral decision-making.
League of Women Voters
The League of Women Voters of the United States is strictly nonpartisan; it neither supports nor opposes candidates for office at any level of government. At the same time, the League is wholeheartedly political - working to influence policy through education and advocacy. It is the original grassroots citizen network, directed by the consensus of its members nationwide.
Annenberg Political Fact Check
'We are a nonpartisan, nonprofit, 'consumer advocate' for voters that aims to reduce the level of deception and confusion in U.S. politics. We monitor 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. Our goal is to apply the best practices of both journalism and scholarship, and to increase public knowledge and understanding. The Annenberg Political Fact Check is a project of the Annenberg Public Policy Center of the University of Pennsylvania.'
"A service of the St. Petersburg Times and CQ."
Center for Public Integrity
"The Center for Public Integrity is a nonprofit organization dedicated to producing original, responsible investigative journalism on issues of public concern. The Center is non-partisan and non-advocacy. We are committed to transparent and comprehensive reporting both in the United States and around the world."
"OpenSecrets.org is your nonpartisan guide to money's influence on U.S. elections and public policy."
"Ballotpedia is a free, collaborative, online encyclopedia. It focuses on ballots, ballot measures, ballot access for initiatives and candidates, petition drives, the supporters and opponents of initiatives and, in general, all things ballot."