Ronald Dworkin famously argued that the best interpretation of a Constitution should both fit and justify the legal materials, for example, the text, original meaning, and precedents. In his recent book, Against Obligation (Harvard University Press, 2012), Abner S. Greene provocatively and creatively bucks the tendencies of constitutional theorists to profess fidelity with the past in constitutional interpretation. He rejects originalist understandings of obligation to follow original meaning in interpreting the Constitution. And indeed he rejects interpretive obligation to follow precedent. In this Essay I focus on Greene’s arguments against interpretive obligation to the past, in particular, his argument that even constitutional theorists...