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Halperin: Romney has shown Santorum, Gingrich have 'feet of clay'

Has Mitt Romney successfully shown the GOP base that Rick Santorum and Newt Gingrich have serious political flaws? Time's Mark Halperin thinks Romney can rally the base because he's shown them there is no "pure candidate" in the race. How will Santorum respond to Romney's win? NBC News' Tom Brokaw joins the conversation.