I don’t try to keep up with the daily cascade of insanity from the Left. Even if you did nothing else, it would be impossible to catalog a fraction of it, let alone try to respond intelligently. I take it, though, that Democratic politicians if pressed might disassociate themselves from the wildest excesses of the Twitter mob, while at the same time never parting company in any important way with the nihilist, anti-American Left. Here is an instance, however, where deniability is impossible, because the lunatic is the Democrats’ nominee for New York’s 27th Congressional District, Nate McMurray–the same man...