Rudy Giuliani's announcement that he will seek the Republican presidential nomination brings to my mind a book I wrote in the early 1990s, "The Conservative Crack-Up." When I wrote the book, Ronald Reagan's successor, President George H. W. Bush, was ignoring many of the constituent ingredients of the Reagan Revolution, for instance, tax cuts. The various factions of the conservative coalition were disgruntled and threatening to take a walk. Once again liberal pundits were diagnosing the conservative movement as moribund.