Open Secrets Web site that makes campaign contributions easier to comprehend from the data collected and supplied by the Federal Election Commission (below) and other sources. "The Center for Responsive Politics is the nation's premier research group tracking money in U.S. politics and its effect on elections and public policy. Nonpartisan, independent and nonprofit, the organization aims to create a more educated voter, an involved citizenry and a more transparent and responsive government.'
Federal Election Commision "In 1975, Congress created the Federal Election Commission (FEC) to administer and enforce the Federal Election Campaign Act (FECA) - the statute that governs the financing of federal elections. The duties of the FEC, which is an independent regulatory agency, are to disclose campaign finance information, to enforce the provisions of the law such as the limits and prohibitions on contributions, and to oversee the public funding of Presidential elections."
FollowTheMoney tracks campaign finance primarily at the state level. Data currently is limited to 2012 for the latest.
CampaignMoney.com is a commercial site supported by ad that provdies search and access to FEC data on campaign contributions.