OpenSecrets.org has fundraising profiles for all 535 members of Congress (and more).
If you've ever wondered who pays the bill for all those TV ads and political campaigns for Congress every election year, Dollarocracy is just the ticket! Learn how Washington really works:
10 Things every American needs to know about money in politics
Contribution profiles for every member of Congress
and every major industry and interest group
Spending and contribution profiles of every Congressional and Senate race