MUSCATINE, IA - DECEMBER 29: Republican presidential candidate former U.S. Senator Rick Santorum (R-PA) listens to a question during a campaign stop at The Button Factory restaurant on December 29, ... more 
MUSCATINE, IA - DECEMBER 29: Republican presidential candidate former U.S. Senator Rick Santorum (R-PA) listens to a question during a campaign stop at The Button Factory restaurant on December 29, 2011 in Muscatine, Iowa. The GOP presidential contenders are crisscrossing Iowa in the final stretch of campaigning before the January 3rd caucus, the first test the candidates must face before becoming the Republican presidential nominee. (Photo by Scott Olson/Getty Images) less 
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Getty Images | Photo By Scott Olson / Getty Images
Thu, Dec 29, 2011 4:31 PM EST