Liberals are famous for shaming conservatives for their past associations with questionable characters, while they exempt themselves from the same standards. What a shocker! Every other week, a liberal Twitter troll cites a Republican politician's innocent appearance at some long-forgotten political event with the likes of a Ku Klux Klan member, hoping to besmirch his reputation. Better yet, sometimes one of them will post a black-and-white photo of such an appearance, as if it's a smoking gun that will end the hapless Republican's career. It shouldn't surprise you that liberals had no problem with Sen. Robert Byrd's despicable association with...