This week on The King’s Necktie, I’m going to do something I’ve never done before in four and a half years of writing this blog: devote an entire essay to a single piece of journalism by another author.

I’m doing that because last week the conservative foreign policy thinker Robert Kagan published a juggernaut 6000 word op-ed in the Washington Post titled “Our Constitutional Crisis Is Already Here,” forcefully laying out the…