Since the 1960s a resurgence of interest in the moral foundations of politics has fueled debates about the appropriate sources of our political judgments. Ian Shapiro analyzes and advances these debates, discussing them in an accessible style. He defends a view of politics called critical naturalism as a third way between the neo-Kantian theory of John Rawls and the contextual arguments of Richard Rorty, Michael Walzer, Alasdair MacIntyre and others...