COLUMBIA, S.C. – The Republican presidential sweepstakes shifted Wednesday to South Carolina, where former Massachusetts Gov. Mitt Romney hopes to keep running the table of contests while his rivals try to halt his momentum toward the GOP nomination.

Former House Speaker Newt Gingrich, former Pennsylvania Sen. Rick Santorum and Texas Gov. Rick Perry fanned across the Palmetto State in hope of salvaging their campaigns by wooing the state's large Christian evangelical population and by raising questions about Romney's conservative credentials.

Gingrich launched a not-so-thinly-veiled attack on Romney in Rock Hill. Without mentioning him by name, Gingrich dismissed the GOP front-runner as a "Massachusetts moderate."

He also attacked Romney's record with Bain Capital, the private-equity firm that Romney co-founded. The firm profited by investing in troubled companies, turning some into successes while others failed. Often jobs were shed in the restructuring process – which Gingrich and Perry are attacking as evidence of Romney's coldhearted capitalism.

Romney has said that attacking his record at Bain "put free enterprise on trial."

But Gingrich insisted to a standing-room-only crowd at Rock Hill's Laurel Creek Club that Romney's time at Bain is fair game.

Perry, who finished last in the six-man field in New Hampshire, also took shots at Romney for his work at Bain.

"I understand the difference between venture capitalism and vulture capitalism," Perry said at a Lexington restaurant. "I'm kind of like that old ad, I believe in doing it the old-fashioned way. I happen to think companies like Bain Capital could have come in and helped these companies if they were truly venture capitalists, but they're not. They're vulture capitalists. And that's what I want the people of South Carolina to think about."

The attacks on Romney will likely grow louder in the run-up to the Jan. 21 primary. South Carolina is perhaps the last best chance for Perry, Gingrich or Santorum to upset Romney, or to at least slow his momentum.

But the three GOP candidates are courting the same pool of voters – the 60 percent of likely Republican voters who are self-described Christian evangelicals. That bloc could be cool to Romney, a Mormon. About 150 evangelical leaders, wary of a Romney nomination, are scheduled to meet in Texas on Friday to consider uniting behind a single anti-Romney alternative.

Gingrich said his campaign will "consolidate conservatives across South Carolina" over the next 10 days.

After barely edging out Santorum in Iowa last week and crushing the entire Republican field in New Hampshire on Tuesday, Romney leads polls in South Carolina. Given the state's conservative culture and its reputation for bare-knuckle politics, Romney knows he's no shoo-in.

"I've got an uphill climb in South Carolina ahead of me," he told NBC's "Today" show Wednesday.

Romney hopes to stay above the fray through a three-pronged strategy: Concentrate his fire against President Barack Obama, use surrogates to attack Republican rivals, and try not to demolish those rivals so that they'll stay strong enough to split the anti-Romney vote.

Romney has reacted mildly so far to his GOP rivals' attacks, saying, "I think it's something we expected to come from President Obama. We didn't expect that Newt Gingrich and Rick Perry would become the witnesses for his prosecution, if you will."

After South Carolina, the next test will be Florida's Jan. 31 primary. In a new Quinnipiac poll of the Sunshine State, Romney leads Gingrich by 10 percentage points, Santorum is third and Perry fourth.

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