I don't expect anymore bombs to be dropped from McCain. The Ayers/ACORN/Wright stuff is the best they have. Otherwise they would have pulled it out by now. If he waits any longer, it will be called a desperate last grasp for straws. I don't think he can pull anything off these days. His best shot is to prevent Obama from absolutely crushing him, which would do a lot of damage to the GOP in general, cutting its chances to recover for 2010.
It all depends on what happens tomorrow. If the public likes a certain thing McCain does, I expect him to run a mixture of that, talking up his foreign experience, the "scandals" of Obama, and the few things the public thinks he is better than incompetent at.
Palin will continue to undercut him, more conservatives are going to come out and talk about McCain's disastrous run, and more far right wingers will be outspoken, giving the public at large an image that McCain is too far to the right to be taken seriously. Since McCain will try to underplay them, there will be the image to his supporters that he doesn't like them. They won't go to Obama but they might just end up staying home, cutting him considerable support in the swing states that have 5% of the GOP vote tied up from the racist right, ensuring that Obama nets all the swing states and brings him to much closer margins for some of the more far right states like Georgia and Mississippi, shaking some of the foundations of assurance the GOP had in the deep south.
Maybe I'm too left optimistic but the 4th could see a huge fracture in the GOP that will cause it to scramble around desperately to find a new identity if Obama were to win a massive victory of over 350 EVs. Especially if he nabs states like Indiana, Colorado, North Carolina, Florida, and maybe even an electoral vote from Nebraska. A lot of these could have been considered GOP strengths and now they are gone.
