The collapse of Rudy Giuliani’s presidential bid is surely one of the most striking developments of the 2008 campaign. Strategic mistake? I don’t think so. Rudy lost because he dissed social conservatives. In fact, the reason Giuliani missed those early primaries is because he dissed social conservatives. Giuliani’s attempt to take apart and reconstitute Ronald Reagan’s winning political coalition was his original sin. And Rudy’s primal transgression continues to shape the dynamics of 2008’s Republican presidential race. With Reagan’s erstwhile coalition now cast out of the garden of amity, only recognizing and understanding Rudy’s fault will allow us to find...