Updated from 7:31 p.m. EST with Gingrich claiming victory in South Carolina primary.COLUMBIA, S.C. ( TheStreet) -- Newt Gingrich won the South Carolina primary Saturday in what was a sharp blow to former front-runner Mitt Romney. "Thank you, South Carolina!" Gingrich tweeted. "Help me deliver the knockout punch in Florida. Join our Moneybomb and donate now."