Professor Amar, it is frequently said (by him, among others), has been cited by the Supreme Court more than anyone else in his generation.  This week, he is once again cited.  We discuss the case, the citation, the underlying theory, and citation in general.  Along the way we find ourselves in company with the Great Dissenter, with his namesake John Marshall, and many more.  This small citation in a concurrence takes us to a legal theory that has enormous implications.