Transcript for Romney Jabs Gingrich's Marriage History
Your voice your vote tonight in just three days now to go before the ABC news Republican debate in Iowa and tonight. The gloves have come off as Mitt Romney takes aim at the new front runner Newt Gingrich. -- hoping to make a point with a new ad featuring Bobby and his wife. And what it says about his opponent here's ABC's John -- On the surface it looks like a feel good campaign ads touting Mitt Romney husbands and families of -- the same woman for forty -- it. I -- -- for 42 years. Except in this case Romney's main opponent is Newt Gingrich. A man who has been married three times and has admitted to infidelity that Romney is not trying to remind voters about. His marriage is trying to remind voters about Newt Gingrich's. Three marriages and the act which filled -- pictures of his wife and family. Romney closes with a promise if I'm president of -- -- -- be true to my family to my face and our country through its family presidential candidates don't usually you'll need to make that promise. Gingrich today was asked whether moral behavior is a legitimate issue in the campaign I think everything about a candidate has to be held -- and -- -- I suspect everybody who runs for office of this level. Has had some flaws at some point I don't think there -- other than than Christ and on the anybody has been flawless. This morning Romney's wife and signals she's about to take -- more high profile role. That's going to be my job is to try to let people see the other side -- the funny side the humor aside the laid back -- Romney is getting personal just -- his campaign appears to be in real trouble. Yeah upcoming ABC news debate this -- in an Iowa will be the first with Gingrich as the clear front runner he's opened nationally. And new polls today give him double digit leads in three of the first four states to vote. Including 23 point leads over Romney in South Carolina and Florida. Asked about Romney's that Gingrich said tonight he's not gonna pick a fight with a Romney instead saying quote he's gonna run on his strengths and I'm gonna -- on line. David. Jon Karl thank you and John as you know all of this to be continued at the blockbuster ABC -- Republican debate again it's this Saturday night in Iowa. The stakes higher by the -- Diane Sawyer George Stephanopoulos moderating -- we hope you'll tune in 9 PM eastern 6 Pacific.
This transcript has been automatically generated and may not be 100% accurate.