(I)f the Dems had even a half a lick of sense, this is the ad they would be running in response (to the one McCain "objects" to):

Unflattering photo of John McCain.  Voiceover: “When John McCain’s political party wanted to run a controversial advertisement, John McCain vowed to stop it.”  Roll footage of him saying the stuff about how he will bring to bear everything he could to stop it.  Cut to a black screen with graphics that read:  “The ad ran anyway.”  Cut to second black screen reading: 84 times (or however many it is, if it’s a lot).  Cut to another unflattering shot of McCain.  Voiceover:  “If John McCain can’t even lead his own political party, how can we expect him to effectively lead our nation?”

But of course the Dems would never run an ad like that.  It is much too effective.