From the Center for Responsive Politics, a non-partisan research group, this resource tracks the influence of money such as donors contributions, candidate fundraising and spending.
Interactive tool for seeing how money influences politics. Pulls data from the Center for Responsive Politics and the National Institute on Money in State Politics
Comprehensive statistics on U.S. Presidential elections from 1789 to the present. See also Data Planet (Browse by Source: David Leips Political Atlas).
Free datasets showing results of electoral contests from over 100 countries. Created by David Lublin, Professor of Government in the School of Public Affairs at American University.