Republican presidential hopeful Rick Santorum points to a television showing his campaign stop Sunday at the Daily Grind coffee shop in Sioux City, Iowa. Mr. Santorum is enjoying a surge ahead of Tuesday's Iowa caucuses. (Associated Press)

Republican presidential hopeful Rick Santorum points to a television showing his campaign stop Sunday at the Daily Grind coffee shop in Sioux City, Iowa. Mr. Santorum is enjoying a surge ahead of Tuesday's Iowa caucuses. (Associated Press)