19 January 2012
Last updated at 20:08 ET
Newt Gingrich is hoping to pick up votes from supporters of Rick Perry
The four remaining US Republican presidential contenders are making final appeals in a last-ditch debate before the South Carolina primary.
Mitt Romney, Newt Gingrich, Ron Paul and Rick Santorum are debating in Charleston after a dramatic day.
As Mr Gingrich gained on Mr Romney in the polls, an ex-wife revealed in an interview he wanted an “open marriage”.
Meanwhile, Rick Perry pulled out of the race and Iowa said a vote mix-up meant Mr Romney had not won its caucuses.
Mr Romney, a former Massachusetts governor, is the front-runner in the state-by-state race for the Republican Party’s nomination to challenge Democratic President Barack Obama for the White House this November.
He is ahead of Mr Gingrich a former speaker of the House of Representatives, and won the New Hampshire primary earlier this month.
On Thursday former Pennsylvania Senator Rick Santorum – courting the social conservative vote in the Palmetto State – was certified to
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