Republican presidential candidate and former Pennsylvania Sen. Rick Santorum speaks Dec. 28, 2011, to local residents during a campaign stop at USA Furniture and Bedding in Dubuque, Iowa. (Associated Press)

Photo by: Charlie Neibergall

Republican presidential candidate and former Pennsylvania Sen. Rick Santorum speaks Dec. 28, 2011, to local residents during a campaign stop at USA Furniture and Bedding in Dubuque, Iowa. (Associated Press)