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Official campaign law
Federal Election Commission
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. . . .
FEC campaign finance
Official source of all the info used by other sites, but not as pretty. Provides rawer data, fewer pie charts & analysis.
Open Secrets - Center for Responsive Politics
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.