Former Speaker of the House Newt Gingrich speaks during a campaign stop on Jan. 19, 2012 in Walterboro, S.C. (Photo by Joe Raedle/Getty Images) The PBS NewsHour's politics team is on the ground in South Carolina covering the busy days…

Rick Santorum, left, Mitt Romney and Newt Gingrich at Monday's GOP debate in Myrtle Beach, S.C. Photo by Charles Dharapa/Getty Images. The five Republican presidential candidates met in Myrtle Beach, S.C., Monday night for what became a feisty forum showcasing…