President Trump is finally on the verge of being impeached — a fate he has richly deserved since he fired James B. Comey as FBI director on May 9, 2017, to stop the investigation of his campaign’s ties to Russia. So why am I so depressed and worried? In part because there is no chance of Trump being convicted. Tim Alberta of Politico calculates that, at best, only five Senate Republicans might vote to remove him despite ironclad evidence of guilt. Having survived impeachment, Trump could win reelection. He is almost certain to lose the popular vote, probably by a...