Tonight's primary results may ultimately decide the fate of the GOP nomination contest. If Mitt Romney wins Wisconsin, he may effectively seal the deal and his inevitability will likely go unquestioned. But if Rick Santorum can pull out a victory in the Badger State, all eyes will be on the nominating contest in the former Senator's home state of Pennsylvania three weeks later. We're joined now by Takeaway Washington correspondent Todd Zwillich and Republican Strategist and Takeaway Contributor Ron Christie.