I’ve been thinking about the first time McCain ran for president in 2000. It was the absolute best political event I ever covered. Not sure it was entirely a race, since he was up in New Hampshire for months and months all by himself, just going to town meetings and talking about campaign-finance reform. It was what everybody imagines an underdog campaign would be like — a few reporters and the candidate, driving around in a bus, telling jokes, talking about issues, and of course arguing about where to eat dinner that night. But it was also a crusade —...