SPARTANBURG, S.C.– Bill Clinton just staged a passionate defense of his wife here, after a voter asked how Senator Hillary Rodham Clinton could unite this country when it is so split, politically and racially, and when she is such a polarizing figure. The question unleashed an attack against the Republicans and an unusual assertion that Mr. Clinton had somehow escaped those attacks (has he forgotten so quickly?); he said he understood the right-wing bullies because he grew up with them. And he said that when they “didn’t have me to kick around anymore,” they went after his wife. The question...