What's in an oath? That fascinating question arose as part of a crusade by Rowan County, Kentucky, Clerk Kim Davis to seek a religious exemption from issuing marriage licenses to gay couples. Before the U.S. Supreme Court put the kibosh on her claim, Davis in her legal brief argued that she understood her oath of office "to mean that, in upholding the federal and state constitutions and laws, she would not act in contradiction to the moral law of God." Why? Because her oath included the words, "So help me God." Of course, the oath of office prescribed by the...