MORE: Greg Sargent says it's unfair to point out Hillary's bad southern accent because "Hillary was actually quoting the hymn lyrics of someone else -- while clearly and very openly imitating (not very well, it turns out) the cadences she thought the lyrics would traditionally have been delivered in. There was nothing phony about it at all."
I'm not sure about that. Imagine, say, Mitt Romney trying to sound like a southern black woman while reading a poem in Selma. I don't think he'd come across any better, and I suspect that he'd be widely mocked for it. Really, fake accents are like funny hats -- things that all prudent and experienced politicans should avoid.