Mitt Romney Hits Newt Gingrich With New Ad

Subtle, but brutal:
I think that people understand I'm a man of steadiness and constancy. I don't think you are going to find somebody who has more of those attributes than I do. I have been married to the same woman for 25 -- excuse me. I will get in trouble. For 42 years. I have been in the same church my entire life. I worked at one company -- Bane -- for 25 years and I left that to go off and help save the Olympic games. If I'm president of the United States I will be true to my family, faith and our country and I will never apologize for the United States of America.
My emphasis. And that emphasis is a direct attack -- and successful hit -- on Newt Gingrich.

Gingrich can yell "flip-flopper!" from the rooftops all that he wants -- but it will be hard to rebut the "I've been true to my one wife" line of attack.