Why vote for Nader? Good question. It's the same logic as when FR people, knowing that Bush will need every vote, say they're going to stay home on election day for some reason or another. "That'll show 'em" is the attitude. I just can't understand that way of thinking from a conservative side - it must be much more frustrating for a Dem who's used to people voting in liberal lockstep.
Nothing is forever. A presidential term is four years. If you don't bitchslap the Republicans every now and then, you get go-along-to-get-along drones like Hastert and Dole. A stronger CP and LP would mean a stronger GOP.