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The official website of the Federal Election Commission. Look up the campaign finance details of any candidate in any cycle since the commission was established.
The Center for Responsive Politics' central repository for all things campaign finance and influence in elections in America.
https://fivethirtyeight.com/politics/
Website that creates statistical and visual models for every federal election in every single election cycle.
http://clerk.house.gov/public_disc/financial.aspx
The official website of the Clerk of the House of Representatives. Provides all public disclosures made by members of the House. The reports include everything from official travel to how much members' staffers are being paid.
https://www.senate.gov/legislative/lobbyingdisc.htm#lobbyingdisc=lda
The official website for public disclosures made by senators. The reports include everything from official travel to lobbying activities.