Former Speaker of the House Newt Gingrich wins the Republican U.S. presidential primary in South Carolina Saturday, with Mitt Romney coming in second, according to U.S. network projections.<br/> Gingrich's victory means that three different candidates have won the first three contests in the state-by-state battle for the Republican presidential nomination to face Democratic President Barack Obama on Nov. 6.<br/> Rick Santorum won the Iowa caucuses on Jan. 3 and Romney won the New Hampshire primary on Jan. 10.<br/> Deborah Lutterbeck, Reuters
