What made this response all the more baffling is that Trump was clearly hoping to pull off just the kind of debate that transpired. He was more subdued, less outlandish, and far, far nicer than he has appeared in any previous debate. He was boring. His opening and closing statements sounded — unusually for him — as though he had practiced them. He appealed to party unity. He sought to rise above his competitors not by belittling them, as usual, but through magnanimity. In reality, Trump is the same uninformed clown he always has been. His response on every question...