Overall Nader, obviously, for the reasons Polnut mentioned.
Why blame Rather as opposed to Voter News Service? In addition, I think the idea that Bush lost massive numbers of votes in the panhandle is overblown. The call of Florida was 10 minutes before the polls were to close there, and it would've cost Gore votes as well. And of course I could just as well argue that if those people didn't care enough to vote under those circumstances they shouldn't be voting to begin with.
And obviously it's not Buchanan's fault that the ballot in Palm Beach County was messed up.