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Associated Press
FILE - In this April 2, 2012, file photo, then Republican presidential candidate former Pennsylvania Sen. Rick Santorum speaks in Shawano, Wis. Some of Mitt Romney’s former foes have yet to endorse him as the Republicans’ presidential nominee. Santorum campaigned hard against Romney and the health care overhaul he signed into law as Massachusetts governor. Conservatives cast it as a precursor to Democrats’ national plan and Romney has vowed to repeal it. Santorum advisers say he will not back Romney until he is convinced that Romney is committed to upending it, as well as ensuring conservatives’ views are represented in the party’s platform and in Romney’s campaign. (AP Photo/Jae C. Hong, File)

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