The Clintons have never understood how to exit the stage gracefully. Their repertoire has always been deficient in grace and class. So there was Hillary Clinton cold-bloodedly asserting to USA Today that she was the candidate favored by “hard-working Americans, white Americans,” and that her opponent, Barack Obama, the black candidate, just can’t cut it with that crowd. “There’s a pattern emerging here,” said Mrs. Clinton. There is, indeed. There was a name for it when the Republicans were using that kind of lousy rhetoric to good effect: it was called the Southern strategy, although it was hardly limited to...