Although Newt Gingrich still trails Republican presidential front-runner Mitt Romney in South Carolina primary polls, he hopes debate performances will be a 'big factor' in winning over supporters.All About Mitt: Rivals Make GOP Front-Runner THE Debate Issue | 2012 GOP Candidate TrackerOPINIONS: Gingrich Spars With Debate Moderator, Rivals | Romney's Immigration Stance Could Cost Him White HouseVIDEOS: Romney on Fixing Social Security | Santorum Talks Tax Cuts | Paul on Foreign Policy VIDEOS: Perry Calls for Romney Tax Records | Gingrich: 'Only Elites Despise Earning Money' SATURDAY: Complete Coverage of the South Carolina Primary, Beginning at 6PM ET on Fox News and FoxNews.com