Rick Santorum has been called a latter-day Savonarola. That’s far too grand. He’s more like a small-town mullah. “Satan has his sights on the United States of America,” the conservative presidential candidate warned in 2008. “Satan is attacking the great institutions of America, using those great vices of pride, vanity and sensuality as the root to attack all of the strong plants that has so deeply rooted in the American tradition.” When, in heaven’s name, did sensuality become a vice? Next he’ll be banning Barry White. Santorum is not merely engaged in a culture war, but “a spiritual war,” as...