Newt Gingrich along with his wife, Callista, addresses supporters at the Hilton Hotel in Columbia, S.C. following his primary victory. South Carolina voters have chosen the GOP nominee since 1980.
JEFF SINER/MCT /Landov
GOP presidential hopeful Newt Gingrich addresses the South Carolina Chamber of Commerce on Tuesday in Columbia, S.C. The state holds its primary on Saturday.
Paul J. Richards/AFP/Getty Images
Republican presidential candidate former U.S. Sen. Rick Santorum speaks to supporters after announcing that he was endorsed Saturday by the evangelical Christian leaders group.
Mark Wilson/Getty Images