It wasn’t twenty years ago today, as the Beatles once sang – only four, to be exact (though at times, it feels like two decades). And while Donald Trump isn’t Sgt. Pepper, he has succeeded in making American march to a different beat. It was four years ago on this date that Trump did the improbable – he descended down a Trump Tower escalator and leapt into a busy Republican primary field. Some of us who follow these things for a living refused to take him seriously at the time. That includes yours truly. I thought Trump was trying to...