Probably not the most PC thing she's ever said, but she is trying to make a TRUE point here to the superdelegates. The media has been going on for months about "white voters this and black voters that." Are the media playing the race card? How else is she supposed to make her case and describe these particular voters? Call them Reagan Democrats? Is that the code word for non-college educated whites?
She's likely to win in WV and KY next Tuesday with exactly these voters. She didn't say anything bad about black people, she simply stated a political fact about where the chips are falling.
Obama will win the nomination, but he will lose the general election because of the demographic she is talking about.