GOP presidential candidate Rick Santorum holds "Rock the Caucus" campaign event with high school students in Des Moines,Iowa

Republican 2012 presidential candidate and former Pennsylvania Sen. Rick Santorum makes remarks as members of his family listen at a "Rock the Caucus" event at West Des Moines Valley High School, Iowa, January 3, 2012. Polls indicate a tight race between Paul, former Massachusetts Gov. Mitt Romney and former Senator Rick Santorum on the final day of Iowa's first-in-the-nation caucuses tonight. UPI/Mike Theiler