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Paul Sancya, Associated Press
Republican presidential candidate Rep. Ron Paul, R-Texas, gestures during a Republican Presidential debate Monday Jan. 23, 2012, at the University of South Florida in Tampa, Fla.

TAMPA, Fla. — Republican presidential contenders Mitt Romney and Newt Gingrich clashed repeatedly in heated, personal terms Monday night in a crackling campaign debate, the former Massachusetts governor tagging his rival as an "influence peddler" in Washington, only to be accused in turn of spreading falsehoods over many years in politics.

"You've been walking around the state saying things that are untrue," Gingrich said to his rival in a two-hour debate marked by interruptions and finger pointing.

The debate marked the first encounter among the four remaining GOP contenders — former Pennsylvania Sen. Rick Santorum and Texas Rep. Ron Paul shared the stage — since Gingrich won the South Carolina primary in an upset last weekend, a double-digit victory that reset the race to pick a rival to challenge President Barack Obama this fall.

Romney was the aggressor from the opening moments Monday night, saying Gingrich had "resigned in disgrace" from Congress after four years as speaker and then had spent the next 15 years "working as an influence peddler" in Washington.

In particular, he referred to the contract Gingrich's consulting firm had with Freddie Mac, a government-backed mortgage giant that he said "did a lot of bad for a lot of people and you were working there."

Romney also said Gingrich had lobbied lawmakers to approve legislation creating a new prescription drug benefit under Medicare.