I’m sorry but, on purely tactical grounds, what a bonehead move by the Romney campaign. Negative attacks, especially in a primary, have to be run on a careful cost-benefit analysis, and what exactly is the upside here? That at least Tom Brokaw isn’t Dan Rather? Romney is comfortably up in the Florida polls in large part because his campaign (with the unwitting collusion of NBC News!) managed to turn Gingrich’s flank on the wealth issue and cut him off from reinforcement via a Newt-versus-the-establishment-media moment. He now affords Gingrich such a moment with juuuuust enough time before the polls close to be impactful.
I’m not saying this is going to cause Romney the primary or anything, but that’s not the point. The point is that it’s hard to see what at all this could have done to help him win it.