Justice Ruth Bader Ginsburg, the highest-ranking classical-music fan in the federal government of the United States, will preside tonight at the wedding of Michael Kaiser, president of the Kennedy Center for the Performing Arts, and the economist John Roberts — not to be confused with the Supreme Court Justice of the same name, who believes that the Defense of Marriage Act reflected "interests in uniformity and stability." This is not, of course, the first time that a member of the Supreme Court has officiated at a high-profile wedding. In 1994, Justice Clarence Thomas presided at the third marriage of the rabidly right-wing talk-show host Rush Limbaugh; it ended in divorce.