As a presidential candidate, former New York City Mayor Rudy Giuliani is for real. Despite his unorthodox Republicanism — his support for legal abortion, his embrace of gun-control, and his unwillingness to act against court-imposed same-sex marriages — Giuliani now leads in several polls for the GOP nomination. The common wisdom is that most Republican voters know nothing of Rudy’s social liberalism, and so his support will dwindle as they learn more. But this may prove wrong. Knowledgeable folks on the Right, disheartened by a presidential field that lacks viable, trustworthy conservatives, are talking themselves into supporting the man who...