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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Israeli Prime Minister Benjamin Netanyahu addresses the American Israel Public Affairs Committee policy conference in Washington on March 2. Netanyahu also addressed Congress at the invitation of Republicans, who were strongly allied with AIPAC in fighting the nuclear agreement. Nicholas Kamm/AFP/Getty Images hide caption

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Ohio Gov. John Kasich's supporters have spent more on TV ads than any other presidential candidate, despite a late entry into the race. New Day For America/YouTube hide caption

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Donald Trump holds financial documents at his campaign announcement in June. He had said he didn't need donors because he could pay for his campaign himself, but he recently said he'd be open to people "investing" in his campaign. Christopher Gregory/Getty Images hide caption

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U.S. Secretary of State John Kerry talks to U.S. Secretary of Energy Ernest Moniz during Iran nuclear deal negotiations. Carlos Barria/AP hide caption

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J. Russell George, Treasury inspector general for tax administration (from left), Acting IRS Commissioner Steven Miller and former IRS Commissioner Douglas Shulman before they testified to the Senate Finance Committee in 2013. Win McNamee/Getty Images hide caption

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