There are conditions that one must meet before being able to participate in the debates. One such rule is that they must have support from a certain percentage of the electorate (I forget if it's 5% or 15%). So, in short, Ralph won't be there.
My daughter told me yesterday that a lot of her friends at college(University of Ky.) are going to vote for Nader if they are not already voting for Bush.
http://captainnormal.typepad.com/captainnormal/2004/10/if_youre_voting.html
George Bush's record on civil rights is so abysmal that his supporters are already pushing to censor a damning report card from the U.S. Commission on Civil Rights. Hardly the "gentleman's C" that sufficed at Yale, Bush's grade from the independent, bipartisan commission on race matters is an indictment worthy of an outright F.
Unless you are a political newbie, that's a dumb question.
Buchanan had Perot's matching fundsin 2000 and they would not let him participate.
At least one 3rd party candidate is presently on the ballot in more states than Nader and he won't be there either.
If you are a newbie, I'm sorry you had to find out it's a fixed game.
Now don't rush in to denial, just retch a few times and pretend you are still a political virgin. That's SOP for those that bother to vote.