Rick Perry’s latest ad fires at multiple targets, including Mitt Romney and Barack Obama. But the first person it whacks is Newt Gingrich. And while most GOP primary voters will already know that Romney and Obama have both supported health care mandates in the past, the fact that Gingrich has also committed this most venal sin will probably be news, or a reminder of a dimly-noted fact, for all but the most high-information Republicans. As I argued earlier today, I think Newt’s lead–in Iowa and elsewhere–is probably more tenuous than it may now appear. As a good historian, Gingrich will know what happened to Napoleon when he advanced too far and too fast into the heart of Russia, overextending his supply lines. That’s what I see happening to Newt right now. Perry’s new broadside is just the latest reason.