Follow the Unlimited Money – Super PACS
http://reporting.sunlightfoundation.com/outside-spending/super-pacs/

This resource shows all independent expenditure-only committees–better known as super PACS–that have raised at least $10,000 since the beginning of 2011. Click on the FEC filings links to see the original filings on the Federal Election Commission’s web site. Click on each super PAC’s name in the left column to see breakdowns of their spending, including aggregate amounts spent supporting or opposing individual candidates, and a chronological list of all their individual independent expenditure filings with the Federal Election Commission. This has been added to New Economy Analytics, Resources and Alerts Subject Tracer™ Information Blog. This has been added to Business Intelligence Resources Subject Tracer™ Information Blog.