Nader.

[Joe Republic]

The thing that strikes me most about Nader is his sheer arrogance.  Given the choice between Gore and Bush in 2000, Gore was closer to his own views.  Yet he never resented his run or apologised in any way to his supporters for helping Bush to win.

Then, in 2004, pretty much everybody deserted him.  The Green party, most of his closest election strategists and campaign team.  There wasn't a hope in hell he was going to get swing Democratic voters on his side again, which meant he was doomed to an embarrassing defeat.  Yet he still persisted.

I also agree with Andrew on the issue of Nader being used as a 'spoiler' in the swing states.  It really highlighted the dirty tricks used by both main parties, which I think is really ugly politics.