You're crazy Nick. Clark beats Powell pretty easily. Much more charismatic and better grasp of the issues.
I never thought Id say it, but you have been hanging around at Daily Kos entirely too much. Clark is a poor spearker, poor campaigner, he's gaffe prone, comes off like a little weasel, and has no grasp on the issues whatsoever. He's the biggest political opportunist and monday morning quarterback in American politics.
I could see Powell easily breaking 20% in the African American community possibly even 30%. He would also win moderates/independents by a McCain like margin. That leaves Clark with the white liberal base. Eh, your right, maybe I am crazy, Clark may not win a single state.