Every political donation of over $200 has to have certain information attached, including the employer of the person making the donation. Open Secrets takes that information from the FEC filings to determine which industries contribute the most to each party and the various candidates. The results may surprise people, especially those who buy into the notion of “grassroots” support from small donors. Listed below are the top twenty industries contributing to incumbent members of Congress, their total contributions, party split, and their top recipient: