Rick Santorum

FILE - In this April 13, 2012 file photo, Rick Santorum speaks in St. Louis. Santorum was one of Mitt Romney's toughest foes during the GOP presidential race, but the former Pennsylvania senator plans to help Romney appeal to the party's conservative base when he addresses the Republican National Convention.  (AP Photo/Michael Conroy, File)
2016 Republican Presidential Candidate, Former U.S. Senator representing Pennsylvania

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