For the last 30 years, Republican nominations for the Supreme Court have faced personal, ugly, defamatory attacks from Democrats. We’ve been hearing a lot from Democrats and the media this week about how President Trump and Senate Republicans are “violating norms” with their plans to nominate and confirm a Supreme Court justice before the November election. Of course, the clear historical norm in this situation is for a sitting president to nominate and, if his party controls the Senate, for the Senate to confirm a new justice — even in an election year.The norm Republicans are following isn’t the one...