With a new ad in New Hampshire, Romney's gone after McCain for his failure to support the Bush tax cuts and his support of the failed immigration reform/amnesty. But as Slate's John Dickerson reports, the McCain campaign is apparently toying with a response that comes from...Mitt's own people. Dickerson:

The ad hangs Romney with his own words—he advocates for a woman's right to choose and gun control, gets tongue tied on his own hunting practices, and distances himself from Ronald Reagan). What makes the ad particularly powerful for the McCain team, though, is that it was produced by media wizards who now work for Romney. Stuart Stevens and Russ Schriefer are veterans of the Bush campaign, which so effectively used John Kerry's words against him. They moved from Bush to McCain, but left and moved to Romney after the McCain operation imploded. When they were McCain guys, though, they helped put together this ad and pushed for running it, according to McCain aides and advisers. "Russ and Stuart were very animated in several meetings about attacking Romney," says a McCain ally.

Here's the video from Slate, which includes both ads: