Info by and about the U.S. Congress - how to find laws (already passed & being considered) hearings & testimony, speeches given on the House & Senate, & info about members (biographical, $$, etc.)
Administers and enforces federal laws on elections: discloses campaign finance information, enforces the provisions of the law (e.g. limits and prohibitions on contributions) and to oversees public funding of Presidential elections. . . .
Extensive & easily searched data on $ & federal elections & lobbying: individual contributors, PACs, 527s, industry lobbies, gifts & travel, etc. Search by donor & recipient, etc.
Interest groups, lobbies, PACs, $$$
Which groups raise & distribute $$, and to whom. Also how they tend to vote & get rated by interested groups.
Directory of Congressional Voting Scores and Interest Group Ratings by