Billionaire Paul Singer has endorsed Sen. Marco Rubio, R-Fla., for President. He's well-respected among Republican donor circles. Thos Robinson/Getty Images hide caption

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Donald Trump has made hats embroidered with the phrase "Make America Great Again" — an icon of his campaign and frequent giveaway item during his rallies. Robyn Beck/AFP/Getty Images hide caption

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Republican presidential candidate and former Florida Gov. Jeb Bush speaks in Mt. Pleasant, S.C., in September. On Thursday, his campaign announced it had raised over $13 million in the third quarter of 2015. Mic Smith/AP hide caption

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A volunteer with the Koch-funded Libre Initiative directs people in 2014 as groceries are distributed at a food bank it partially sponsors in San Antonio. Eric Gay/AP hide caption

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Warren Buffet is a supporter of Hillary Clinton, seen here campaigning with her in 2007. His company, Berkshire Hathaway, received low marks for transparency around its political spending. Paul Sakuma/Associated Press hide caption

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