"Attila the Hun would be better than Bush." indeed! and Kerry would be better than Attila, so would Nader...slightly. But Nader is not going to be president. Our system does not currently make a 'protest vote' practical....you end up with the worst choice.
(I happen to think Kerry is saying a lot of the right things at the moment, and is looking 'presidential'...Nader is simply not cut out to be the leader of the free world, and should do what he does best for his special causes, rather than assuring that we will have Bush for 4 more years)