Santorum wins Republican presidential nominating contests

The former US Senator and current Republican presidential hopeful, Rick Santorum, has won surprising victories in Missouri, Minnesota and Colorado. The victories are real upsets to the supposed front-runner, former Masachusetts governor Mitt Romney. The Former speaker of the House, Newt Gingrich, hardly campaigned in the three states that voted on Tuesday, and did not even appear on Missouri's ballot. Listen: