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
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
Republican presidential candidates (from left) Ron Paul, Mitt Romney and Rick Santorum participate in the ABC News, Yahoo! News and WMUR Republican Presidential Debate at Saint Anselm College on Saturday in Manchester, N.H.
Win McNamee/Getty Images