U.S. Republican presidential candidate and former Pennsylvania Senator Santorum speaks to the media during a campaign stop in Columbia, South Carolina

 
U.S. Republican presidential candidate and former Pennsylvania Senator Santorum speaks to the media during a campaign stop in Columbia, South Carolina
Republican presidential candidate and former Pennsylvania Senator Rick Santorum (center R) speaks to the media during a campaign stop at the Lizard's Thicket restaurant in Columbia, South Carolina January 16, 2012. Santorum addressed recent campaign advertisements from Super PACs backing Mitt Romney saying they were factually incorrect and were "flat-out lies." REUTERS/Rainier Ehrhardt