Romney puts Gingrich on defensive in Florida debate

Republican presidential hopeful Mitt Romney took the fight to chief rival Newt Gingrich in his most aggressive debate performance yet, five days ahead of Florida's primary vote.

A neck-and-neck race for Florida and its importance for the Republican presidential nomination made for a combustible atmosphere at the University of North Florida in Jacksonville as the candidates sparred repeatedly.

Gingrich, who has displayed a mastery of debating skills during previous debates, was frequently caught flat-footed under attack from Romney who went after his chief rival in an attempt to put his campaign back on track after losing South Carolina last Saturday.

Gingrich and Romney are running close in polls before next Tuesday's primary vote in Florida, the biggest state so far in the early voting for the Republican nomination to face President Barack Obama in November. The most recent polls put Romney ahead.

Romney, a former Massachusetts governor, took umbrage at Gingrich's description of him as "anti-immigrant."

"That's inexcusable," Romney said, turning to his rival. "I'm not anti-immigrant. My father was born in Mexico. ... The idea that I'm anti-immigrant is repulsive. Don't use a term like that."

Gingrich, who has offered a softer version of immigration policy than most Republican conservatives, insisted the United States could not rationally deport millions of people and that some who had lived here for decades should be allowed to stay.

But he added some confusion to his position by saying he would support some version of "self-deportation," the very issue he has criticized Romney for supporting.

"Newt needed a big night to turn around the momentum and he didn't get it. He struck me as tired and too ticked for his own good," wrote conservative columnist Rich Lowry on the National Review's website. His blog post was titled "Newt's worst night."