PBS NewsHour: Romney Focuses More on Iowa, Hoping to Become 'Unstoppable Force' in Primaries

In a flurry of bus touring, pheasant hunting and endorsement courting, GOP presidential candidates are honing and sharing their last-minute campaign messages before next week's Iowa Caucuses. Gwen Ifill discusses the race and year in politics with The Rothenberg Political Report's Stuart Rothenberg and USA Today's Susan Page.