Data

MapLight's website 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)

MapLight also makes available for free, public use our Federal Money and Politics Data Set, an easy-to-access, downloadable database of MapLight-enhanced Federal Elections Commission (FEC) campaign finance data.