NORTH CHARLESTON, S.C. (AP) - The four remaining Republican presidential candidates are getting a final full day of campaigning today before tomorrow's South Carolina primary.

Mitt Romney is clinging to a narrow lead in South Carolina polls, but Newt Gingrich is closing in. Rick Perry dropped out of the race yesterday.

At last night's debate, Newt Gingrich responded to the new allegations from his second wife, Marianne, by saying, "Let me be quite clear. The story is false." He'd been asked about her claim that he had suggested to her that they have an "open marriage."

Gingrich also denounced the moderator, CNN's John King, for raising the issue. He said he was "appalled" that King would start the debate with that question.