UPDATE: Fred Kaplan takes Romney behind the woodshed in Slate.
UPDATE 2: At least WaPo had the sense to run Kerry's rebuttal:
I have nothing against Massachusetts politicians running for president. But the world's most important elected office carries responsibilities, including the duty to check your facts even if you're in a footrace to the right against Sarah Palin. More than that, you need to understand that when it comes to nuclear danger, the nation's security is more important than scoring cheap political points.