Gingrich won't call on Santorum to drop out

BEAUFORT, S.C. - Fresh from receiving the endorsement of presidential dropout Rick Perry, Newt Gingrich said Thursday he would not call on former Pennsylvania Senator Rick Santorum to leave the race, despite the former House speaker's belief that he is the only candidate who can prevent Mitt Romney from getting the GOP nomination.

"Santorum has got to do what he wants to do," Gingrich told reporters in Beaufort. "You all said I was dead in June and July. I didn't get out of the race. No reason he should do anything he doesn't want to do."

Gingrich continued to sidestep questions about his ex-wife Marianne Gingrich's upcoming interview with ABC News in which she talks of his affair with his current wife, Callista, and his request for an open marriage.

"My two daughters have already written a letter to ABC complaining about this as tawdry and inappropriate ... I'm not getting involved," he said.