My response to the Bush McCain mantra would be, “I have as much to do with the Bush Presidency as Barack Obama has to do with the Bombs his friend William Ayers set off at the Pentagon.”
or
“I’d rather be associated with a man who the voters of this nation elected President twice than a man who elected himself judge, jury, and executioner by blowing up the pentagon; Baracks comrade William Ayers is a man who publishes an article on September 11th saying he wished he had done more - maybe he was applauding the hi-jackers he knew were coming to NY. It was published in the NY Times after all. Is that coincidence?”
That's a winner!
What do Obama and Osama have in common? They both know somebody who blew up the Pentagon!