Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles during his campaign stop in Platteville, Wis., Saturday, March 31, 2012. (AP Photo/Jae C. Hong)

Associated Press
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles during his campaign stop in Platteville, Wis., Saturday, March 31, 2012. (AP Photo/Jae C. Hong)
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles during his campaign stop in Platteville, Wis., Saturday, March 31, 2012. (AP Photo/Jae C. Hong)
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