Despite its title, Sam Tanenhaus’ new book is not another premature eulogy for a political movement. In fact, it’s a sound diagnosis of a disfiguring ideological disorder that has turned contemporary conservatism into a monstrously unrecognizable shell of its classical self. But the afflicted are too far gone to pay heed. In the next few weeks, Tanenhaus can expect to be dismissed and denounced as a useful idiot of the left. This will only lend further credence to his argument that the Republican Party has been overrun by reality-denying radicals who would rather nurse perceived grievances than engage the changing cultural zeitgeist.