AP

With Newt Gingrich gaining on front-runner Mitt Romney just two days before the South Carolina primary, expect a fiery exchange between the two men in Thursday night's debate.

One new poll shows Romney's lead over Gingrich slipping to 10 points, down from 19 points two weeks ago. CBS reports that a poll from Politico.com has the two men even closer than that, with Romney holding onto a seven point lead.

Gingrich has been hitting Romney hard, attacking the former Massachusetts governor on everything from his time at private equity firm Bain Capital to his treatment of a family pet. Though receiving heat from Republicans over attacks on Romney's business background--Gingrich has painted Romney as a job-destroying shark--Gingrich persisted, and appears to be resonating with voters.

Missteps from Romney, including a comment about how he likes to fire people who provide him bad service and a reluctance to release his tax returns, have likely added fuel to Gingrich's portrayal of Romney as out of touch.

Romney has been frighting back, accusing the former House Speaker of giving himself way too much credit for jobs created during his time in Congress.

"Congressmen taking responsibility or taking credit for helping create jobs is like Al Gore taking credit for the Internet," Romney quipped at a rally Wednesday night.

Ads from the Romney campaign have also portrayed Gingrich as a loose cannon.

There is a lot of pressure on both men to win South Carolina: past results have shown whoever wins South Carolina has gone on to be the party's nominee.

The two will face off at 6 p.m. for the final debate before Saturday's primary.