Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks during a rally, Friday, March 16, 2012, in Osage Beach, Mo. (AP Photo/Charlie Riedel)

Associated Press
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks during a rally, Friday, March 16, 2012, in Osage Beach, Mo. (AP Photo/Charlie Riedel)
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks during a rally, Friday, March 16, 2012, in Osage Beach, Mo. (AP Photo/Charlie Riedel)
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