I predict that the media, after setting up tonight as the "make or break moment" for the GOP, based on Palin's upcoming speech, will declare her to have failed to dispel the "controversy" over her selection.
And that therefore the election is already lost for McCain/Palin and there's no need for even holding a vote.
Regardless of what is actually said tonight, that will be the spin.
Just like they said Kerry "won" all the debates against Bush.
I think they're afraid of actually having to debate.
UPDATE: I was wrong! The election WAS decided tonight:
McCain/Palin in a landslide!