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American Presidency Project
An extensive collection of materials relating to the Presidency including election data, speeches, party platforms, documents, and other materials.
David Leip's Atlas of U.S. Presidential Elections
Provides detailed information on national results for the major and minor candidates for U.S. President in the presidential elections from 1789 on. Also includes state results beginning with the 1896 elections.
Includes official vote counts for federal elections from the official sources among the various states and territories for the years 1920 to the present plus other information relating to elections. From the U.S. House of Representatives.
A New Nation Votes: American Election Returns, 1787-1825
Although not complete, the site includes data for "all offices from the Federal to the local levels including Presidential elections, Town clerk elections and everything in between." When "complete it will include all 25 states and territories that existed at the time."
Voting America, United States Politics, 1840-2008
Provides cinematic and interactive maps, and analysis, of the Presidential elections in the US from 1840-2008. Maps data by geographic region, political party, voter turnout, voter demographics, and more.
Voting and Registration - U.S. Census Bureau
Information on reported voting and registration based on various demographic and socioeconomic characteristics.
Campaign Finance Disclosure Portal
A single point of entry to campaign finance data from the Federal Election Commission. Includes maps and charts, search tools, and downloadable data sets.
Federal Election Commission
Includes financial information about candidates, parties and PACs, as well as materials on campaign finance law, political contributions, administrative fines, and statistics on elections and voting.
Provides data on campaign contributions, politicians, legislative votes, industries, companies, ballot propositions, and more.
From the Center for Responsive Politics, the site tracks the money behind the candidates in all current Presidential, Congressional, and local elections. Provides information including the total amount raised, top contributors, a searchable database, and more.