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CHARLESTON, SC - JANUARY 19: Republican presidential candidate former Speaker of the House Newt Gingrich (R), next to former Massachusetts Gov. Mitt Romney, makes a point during the opening question of a debate at the North Charleston Coliseum January 19, 2012 in Charleston, South Carolina.
We sort through what happened in South Carolina's primary -- why Gingrich's message resonated so strongly, what went wrong for Romney and what's likely to happen in Florida.
Jennifer Duffy, political analyst and an editor at The Cook Political Report