Romney ad warns Pelosi would sink Gingrich in general election

Mitt Romney's campaign is out with a new ad warning that if Newt Gingrich is the nominee, Nancy Pelosi will reveal information from an Ethics Committee investigation that would doom his campaign.

"Nancy Pelosi served on the committee that found Newt Gingrich guilty of ethics violations. Almost all Republicans voted against him," says the ad's narrator. "Gingrich paid $300,000. Later he resigned in disgrace. Now Pelosi says she'll leak information so secret she once asked her own husband to leave their bedroom so she could discuss it privately on the phone, information so damaging it would help Obama win. Newt Gingrich: We can't afford the risk."

The ad is the Romney campaign's most direct attack so far, though super-PAC ads aired on his behalf have been even harsher on Gingrich.

Over the last few days, Romney's surrogates and others in the Republican establishment have been sounding alarm bells that Gingrich would be a disaster for the GOP if he's the nominee. The ad plays up those fears and goes right at Gingrich's electability.

Watch the ad here: