Politics and business have always had a sticky relationship.
The Brookings Institute released a ranking of U.S. billionaires according to their political influence.
The billionaires' influences are measured by the "use of great wealth for campaign expenditures, activism through non-profit organizations and foundation, holding public office, media ownership, policy thought leadership, and behind the scenes influence."
20. Alice Walton
Alice Walton, one of the Wal-Mart fortune heirs, is an early backer of Hillary Clinton's "Ready for Hillary" super PAC.
Source: Brookings Institute
19. Donald Trump
Multimedia master Donald Trump routinely comments on numerous political issues and has succeeded in amassing a large following of conservatives.
Source: Brookings Institute
18. Marc Andreessen
Marc Andreessen backed GOP presidential candidate Mitt Romney in 2012. He's interested in the future of journalism — and in particular, the swift transition from traditional media to digital.
Source: Brookings Institute
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