Gingrich vows to 'stay positive' as Romney ratchets up attacks

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"For Newt Gingrich, in an effort of self-aggrandizement, to come out and throw a clever phrase that has no other purpose than to make him sound a little smarter than the conservative Republican leadership, to undercut Paul RyanPaul RyanFormer GOP senator: I’d back Trump but not Cruz as nominee House GOP reignites push for budget plan GOP chairman: Our ObamaCare alternative coming before July MORE, is the most self-serving, anti-conservative thing one can imagine happening," Sununu said during the call.

Earlier this year, Gingrich called Ryan's plan "right-wing social engineering." But Gingrich has since apologized for having criticized the plan, and Ryan said Wednesday that he would make a suitable partner in cutting the deficit.

"He misspoke, he acknowledges as much, and let’s leave it at that," Ryan told The Hill.

Romney also launched a television ad Wednesday that plays heavily on his family life — a clear dig at Gingrich, who is twice divorced and has admitted to extramarital affairs.

But Gingrich dismissed questions of whether the attacks had become too personal while campaigning Thursday, saying that Romney was "fine."

Gingrich's thick skin is likely borne out of the robust lead he has built in the polls. A set of CNN polls released Wednesday found the candidate leading by double digits in Iowa, South Carolina, and Florida, while trailing Romney by just 9 points in New Hampshire, long considered a stronghold for the former Massachusetts governor.

-— Erik Wasson contributed to this report.

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