When a Bible-quoting Sunday School teacher, Jimmy Carter, won the 1976 presidential election, it marked the start of a new era of presidential campaign discourse. The successful candidates since then have followed Carter's lead in publicly testifying about their personal religious beliefs and invoking God to justify their public policy positions and their political visions. With this new confessional political style, the candidates have repudiated the former perspective of a civil-religious contract that kept political leaders from being too religious and religious leaders from being too...