A couple of weeks after the 2016 election, I argued that Trump had become a president by accident. He hadn’t chosen his cabinet yet, and I was prepared to give him the benefit of at least some doubts. He was certainly smart enough to be president, I wrote, “but in one respect he is especially ill-equipped for the job’s most important requirement – that of narrator-in-chief.” At best I was half right. The match-up was indeed an accident. The failure of either party to produce a suitable candidate in timely fashion permitted Trump to slip in. But once he gained the…