Shirley is a frequent political commentator of the conservative Republican stripe (a biographer of both Ronald Reagan and Newt Gingrich), but he’ll be puzzling to many ordinary human beings in that regard, since unlike virtually all publicly visible Republicans these days, he isn’t stupid, he isn’t vicious, and he isn’t patently, observably insane. Certainly in terms of his historical writing, at least, he’s the very last thing most Republicans currently are: responsible.