With New Hampshire and Iowa behind them, Republican presidential candidates focused on South Carolina and Florida on Friday.<br/> Front-runner Mitt Romney was introduced to supporters by South Carolina Governor Nikki Haley. The former Massachusetts governor is currently leading in South Carolina, according to recent polls.<br/> Rick Santorum campaigned in York, South Carolina while Rick Perry sought to revive his campaign at the Squat and Gobble restaurant in Bluffton.<br/> After finishing fourth in New Hampshire, Newt Gingrich spent Friday in Florida, speaking to supporters at the opening of a new campaign office in Orlando. The Sunshine state holds its primary on January 31, while South Carolina heads to the polls on the 21st.<br/> Since 1980, every winner of the South Carolina's primary has gone on to win the Republican party's nomination.<br/> Deborah Gembara, Reuters