Vote411.org – League of Women Voters Education Fund: Enter your address to get personalized voting information including the races on your ballot and side-by-side candidates’ positions. Also state-by-state information on polling places, ballot measures, early voting, etc.
Vote Smart Facts Matter: Biographies, voting records, issue positions, ratings, speeches and campaign finance information
FactCheck.org: ”A nonpartisan, nonprofit "consumer advocate" for voters that aims to reduce the level of deception and confusion in U.S. politics.” The site is a project of the Annenberg Public Policy Center of the University of Pennsylvania. They “monitor the accuracy of what is said by major U.S. political players in the form TV ads, debates, speeches, interview and news releases.
PolitiFact.com: PolitiFact is now owned by the nonprofit Poynter Institute for Media Studies. Reporters and editors fact-check statements by members of Congress, the White House, lobbyists and interest groups and rate them on our Truth-O-Meter.”
Election Statistics, 1920 to Present
Federal Election Commission (FEC)
Project538 - ABC News
538 Interactives - Projects, dashboards, forecasts and more.