Right?

If the democratic nom, and the republican nom are so sure of themselves, so sure that they are the best choice, then why are they afraid to debate a 3rd party?!

I mean, if the 3rd party person sucks so bad and is so terrible, then they could totally prove that in a debate.

So yeah, why does the idea of having a real debate with a larger 3rd party candidate scare the other parties so much?