“They’re not all crypto-fascists and right-wing nut jobs,” comments Kendall Roy, the scion of his late father’s media empire on the show Succession, the night before he and his kid brother enthrone a politician answering to that description as America’s newest president. “We also have some venture capital Dems and centrist ghouls. Dad’s ideological range was . . . wide.” So was the ideological range of the Republican Party over the last fifty years. And so it still is...