Washington, D.C., Mayor Muriel Bowser last month. Larry French/Getty Images hide caption

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Democratic mayoral candidate Jim Kenney benefited from a super PAC that helped him win in the city's Democratic primary election. Matt Slocum/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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Rick Perry ended his presidential campaign Sept. 11, but there was $13 million left in the bank of a superPAC supporting him. The superPAC says it's given donors their money back. Scott Olson/Getty Images hide caption

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Alex Brandon/AP

Some superPAC donors are hiding from public scrutiny. iStockphoto.com hide caption

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