Kansas voters will decide Tuesday whether to approve a constitutional amendment prohibiting gay marriage, and the ban's supporters are using a California judge's recent ruling in favor of same-sex unions as one of their chief arguments. Gay marriage is already banned under Kansas law, and the law is not being challenged by anyone. But supporters of the ballot measure say the ban must be put in the Kansas Constitution to insulate it from legal challenge. In Kansas and elsewhere, that argument was bolstered when a San Francisco judge ruled March 14 that California's law against gay marriage violates the California...