Late in life, William F. Buckley made a confession to Corey Robin. Capitalism is "boring," said the founding father of the American right. "Devoting your life to it," as conservatives do, "is horrifying if only because it's so repetitious. It's like sex." With this unlikely conversation began Robin's decade-long foray into the conservative mind. What is conservatism, and what's truly at stake for its proponents? If capitalism bores them, what excites...