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U.S. Elections Data
Maps election results from 1912 to the present, by state or county.
Center for Responsive Politics - OpenSecrets.org
Select Politicians & Elections to search donors, find fundraising by candidate, outside spending, and personal finances, 2004-present. Select Influence & Lobbying for contributions by PACs, 527 organizations, and lobbyists, 1998-present.
Follow the Money
Aggregating from state disclosure agencies, the National Institute on Money in State Politics provides access to campaign contribution data for candidates in state-level elections.
Campaign funding, interest group ratings, positions, and votes of U.S. politicians.
U.S. national-level opinion polls; a subset of the Roper Center Public Opinion Archive searchable by text of question.
Roper Center for Public Opinion Research
Public opinion poll data archive, U.S. and some international. Coverage: 1930s-present.
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