Nader has the same problem Gore does. Both are superlative and passionate journalists, and that's what they should be doing. Both have their moments politically, but just aren't great politicians. Nader hasn't ever held elected or appointed office, but he's all too eager to take potshots on those who have.
Remember, there's a couple other branches of government. I imagine some big veto-proof majorities and very little getting done with a Nader presidency.