The Republican civil war - McCain's "secret" anti-Romney attack ad

An illustrative follow-up to Thomas Edsall's excellent post-Iowa / pre-New Hampshire political analysis, "New Hampshire Will Be Key Battle In GOP Civil War":

Damned Spot: McCain's Secret Attack Ad
As the Romney campaign launches an attack on McCain in New Hampshire, the McCain team is sitting on a counterpunch ad that was leaked to Slate's John Dickerson.

The primary-campaign junkies among you can watch it HERE (if you don't mind waiting through a short ad).

--Jeff Weintraub