In a new book, Sam Tanenhaus, the New York Times Book Review editor, proclaims the death of conservatism. Movement leaders' devotion to "radical" antigovernment ideology, Tanenhaus argues, has left them "trapped in the irrelevant causes of another day, deaf to the actual conversation unfolding across the land." Judging by the massive crowd on Saturday that descended on Washington for the 9/12 March, you'd have to be deaf not to recognize that small-government conservatism remains a vital part of the national conversation. If you've been fed a steady media diet of MSNBC over the last few months, though, you could be...