On Sunday night, Sen. Claire McCaskill (D-Mo.) shared one of the worst kept secrets of the Democrats: Hillary Clinton is a drag on the party. In a television interview, the embattled senator unloaded on the former first lady for dissing Donald Trump’s base and dumping on America’s hinterlands. As McCaskill said, “For those of us that are in states that Trump won, we would really appreciate if she would be more careful and show respect to every American voter and not just the ones who voted for her.” Ouch. McCaskill is guilty of nothing but telling the truth. So long...