I've been thinking about how Obama could blunt the coming attack.  We've know the form of the attack for some time; the only thing they've got is calling him names.  It will be oblique, careful, and deniable, but boiled down to its core Obama will be called two things: a "terrorist" and a "nigger."  Boy, that's ugly when it's said out loud, isn't it?
As among others Digby and a TPM reader pointed out, the nature of the attack has now become clear.  It will be a pretty dance of flunkies calling the names while the leadership denounces it.  Digby calls it "Cokie's law", but I think the term "racist two-step" catches the behavior more directly.
So what can be done?  It's pretty straightforward: reject the denunciation by making it about lack of leadership.  What kind of a leader repeatedly involves racists into his campaign?  What kind of a party is filled with such unapologetic racists that they won't listen to their putative leaders?
Oh, yeah, and make sure to repeat that all-important pejorative -- one of the most powerful words in the language, the only epithet that can be said unapologetically on television and in print.   Say it over and over and over.  
Republicans are racists.  Are you a Republican?