Republican presidential candidate, former Pennsylvania Sen. Rick Santorum talks to supporters during a rally Saturday, March 10, 2012, in Springfield, Mo. (AP Photo/Charlie Riedel)

Associated Press
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum talks to supporters during a rally Saturday, March 10, 2012, in Springfield, Mo. (AP Photo/Charlie Riedel)
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum talks to supporters during a rally Saturday, March 10, 2012, in Springfield, Mo. (AP Photo/Charlie Riedel)
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