Has anyone seen how many states Nader is likely to appear on the ballot? He has got to spend a ton of money and coordinate his petitioners extremely well to appear on enough states to be meaningful. Perhaps Richard Winger at Ballot Access News has some insights and data. Without a party to support him, I think he is going to find it very tough to mount a truly national campaign. In short, I don't think he is going to matter much anyway.
If he only polls .25% in a superclose state it could make the difference. If Bush wins Ohio by 300 votes (which is NOT an exaggeration after what happened last time), he could be the difference.