Well, I never heard anything about him wanting to abolish the U.S. Senate. I saw the man speak last night, and he outlined a VERY ambitious set of goals (made something like 14 points), but none of them involved taking apart our congress, or even amending our constitution.

But to reply to what you said, I think there are very real differences between Nader and the other candidates when you look at his platform. Here's one good resource for that info:
http://votenader.org/
His ideas are a little radical, but they I think they have a lot of substance, and they are nothing like the tired rhetoric Gore and Bush have been trying to sell us.

peace,
murph