Newt Versus Mitt

Negative war between the two frontrunners begins with Romney tagging Gingrich as a Washington insider.

Newt replies: "The only reason you didn't become a career politician was you lost to Ted Kennedy in 1994."

Intense back-and-forth followed by shots on both leaders by Bachmann and Perry and Paul hitting Gingrich.

Both frontrunners hold their own.

Newt and Mitt tangle over the ex-Speaker calling Palestinians "an invented" people.

Gingrich: "I will tell the truth even if it's at the risk...of causing some confusion with the timid."

Romney says the President should not speak for Israel: "The last thing Bibi Netanyahu needs is...someone creating extraordinary tumult in his neighborhood."