Read other letters about this article
I think the answer is that in a debate Nader would reveal what a true change platform would look like--single payer health care, an end to corporate personhood, end of the drug war, etc. This would expose the fact that Obama is actually not offering change, he is merely using the word expediently and fraudulently. His platform is the same as Hillary's-- the same old safe, spineless, moderate Democrat platform. In short, Obama's illusion of change would be shattered. So there is good reason to want to obstruct Nader.