Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens to a question during a campaign stop Saturday, March 17, 2012 in Collinsville, Ill. Romney wrapped up a shortened campaign trip to Puerto Rico on Saturday in favor of spending more time in Illinois, where polls have shown him slightly ahead of chief rival Rick Santorum. (AP Photo/Charlie Riedel)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens to a question during a campaign stop Saturday, March 17, 2012 in Collinsville, Ill. Romney wrapped up a shortened campaign trip to Puerto Rico on Saturday in favor of spending more time in Illinois, where polls have shown him slightly ahead of chief rival Rick Santorum. (AP Photo/Charlie Riedel)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens to a question during a campaign stop Saturday, March 17, 2012 in Collinsville, Ill. Romney wrapped up a shortened campaign trip to Puerto Rico on Saturday in favor of spending more time in Illinois, where polls have shown him slightly ahead of chief rival Rick Santorum. (AP Photo/Charlie Riedel)
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