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OpenSecrets.org

Extracted from the Wikipedia article OpenSecrets.
Center for Responsive Politics
The Center for Responsive Politics was founded in 1983 by retired two U.S. Senators, Frank Church of Idaho of the Democratic Party, and Hugh Scott of Pennsylvania of the Republican Party. In the 1980s, Church and Scott launched a "money-in-politics" project, whose outcome consisted of large, printed books. Their first book, Spending in Congressional Elections: A Never-Ending Spiral, published in 1988, analyzed spending patterns in congressional elections from 1974 through 1986, including 1986 soft money contributions in five states. The first data was published by CRP in 1990 and the website OpenSecrets.org was launched in 1996, making the data more readily available.