GovTrack.us, is a tool created by Civic Impulse, LLC. The site helps ordinary citizens find and track bills in the U.S. Congress and understand their representatives’ legislative record
--includes a fair amount of historical data, back to 1789, on legislation, legislators, and vote counts.
--See the notes on Information Coverage and Timeliness on the site's About page.
MapLight combines three data sets:
--Contributions: Campaign contributions given to each member of Congress. (Source: Center for Responsive Politics)
--Votes: How each member of Congress voted on every bill. (Source: GovTrack.us)
--Support/opposition: Which interest groups and companies support and oppose key bills. (Source: MapLight research team)