Ex-Iowa State Sen. Kent Sorenson defected from Michele Bachmann's campaign before the 2012 Iowa caucuses. In a 2014 plea deal, he admitted that he lied about payments from the Ron Paul campaign. Charles Dharapak/AP hide caption

toggle caption Charles Dharapak/AP

Kent Sorenson says he was paid for his endorsement of Ron Paul in the 2012 presidential campaign — and that the exchange was hidden from the public. Charles Dharapak/AP hide caption

toggle caption Charles Dharapak/AP

She's saying goodbye, for now at least: Rep. Michele Bachmann, R-Minn., has announced she won't seek re-election in 2014. (File photo from Jan. 4, 2012, when she left the Republican presidential race.) Jim Young /Reuters /Landov hide caption

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Hillary Clinton's "inevitability" became less certain after a debate in Philadelphia at Drexel University in October 2007. William Thomas Cain/Getty Images hide caption

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