I will disagree with this.
I think there is a huge difference....between trial work and debates. The biggest difference will be the television coverage. If Edwards is thrown a "curve ball"....he may be quick on his feet, but, with the coverage even the slightest delay or "stutter" in responding to a question will be magnified over and over by MSBC...CNBC,.....FOX....etc..etc..
Whereas, I think that Cheney is good enough to not allow anything to cause him a delayed response or stuttered reply.