There is an old hymn written by Fanny Crosby, sung at generations of camp meetings, which exclaims: "Crown Him! Crown Him! Prophet, and Priest, and King!" Since the emergence of evangelicalism as a cultural force in the 1950s, three approaches to politics, represented by three personalities, have emerged. They are the prophet, the priest and the kingmaker. The prophet has been psychologist James Dobson, who dispenses child-rearing advice on the radio from his Colorado ministry, Focus on the Family. On family issues, Dobson's counsel is moderate and broadly appealing. On politics, his tone sharpens. He rails against compromise on social-conservative...