U.S. Census Bureau: Voting and Registration
U.S. Census Bureau site containing tables, reports and links to other sites about voting and registering to vote for Presidential and Congressional elections in the U.S. "In election years, the Current Population Survey collects data on reported voting and registration, and later reports stats by turnout, age, race and origin."
Sage's Video tutorial to use the CQ Voting & Elections Collection to find data and analysis on all aspects of American elections. This dynamic research tool provides in-depth insight into the American voter, major and minor political parties, campaigns and elections, and historical and modern races for Congress, the presidency, and governorships.