The case that Bob Mueller has brought against Paul Manafort has nothing to do with Donald Trump or the 2016 election. It is irrelevant to any significant political issue. But Democrats worry that Mueller’s prosecution of Manafort for years-ago tax evasion may fail, thereby making a laughingstock of the special counsel investigation in which they have invested so much. What happens when Democrats are afraid they may lose a political battle? Things get nasty. Politico reports on the latest, shocking developments in the Manafort trial: Paul Manafort’s trial will stretch into a fourth week, as jurors headed home Friday without...