Ok, here's the interesting one

When McCain Drops Out - Steve Rosenbaum
When the Republicans choose their candidate on September 4th, there is a
very real chance that they could throw the election into an unexpected
chaos as they pull a genuine September Surprise. I think there is every
reason to believe John McCain won't be the nominee. Ok, let me say that
again. McCain will not be the Republican candidate in November.

Then what's going to happen?