Over 250,000 Democrats voted for Bush in Florida in 2000; Nader did not lose the election for Gore, those 250,000 moderate Democrats did thank God.
And about 3 times that many will vote for McCain over MuBarack Hussein.
Those 250,000 moderate democrats who voted for Bush would have voted the way they did regardless of whether Nadir was in the race. Virtually every one of Nadir's votes came directly from Gore's nutball base.
Many variables, but the vote for Nader exceeded the margin and most pundits say that Nader’s vote came from the dems. When the margin is narrow you can pinpoint several causes.