I don't think America is ready for a president with four eyes and two mouths.
Honestly? I think the really prevalent attitude is, "I'm not racist/sexist, but America is not ready for a (whatever) President." Sure, there are racists here, but none of them are going to vote Democratic anyway.
The way racism and sexism actually play out in this country is extraordinarily complex. I'd be willing to bet that there are plenty of well-educated, liberal Obama voters who would cross the street to avoid a black man in an urban setting, just as there are plenty of Clinton voters who, in practice, participate in old-boy networks. Likewise, I wouldn't be surprised if there were good-ol'-boy Republicans who would be willing to pull over and help a black man with a flat tire. Even my estranged friend the Ron Paul supporter is convinced that there is some sort of Jewish cabal, even after he bailed me out of a few scrapes that I could have avoided if (A) I had any of that Jewish banking money, or (B) I could have called upon the Elders of Zion. So basically you never know.