ABSTRACTThe idea of public reason requires that citizens in their public deliberation employ considerations stemming from a shared conception of justice. One worry is that public reason's content will be incomplete, in that it does not contain sufficient material for adequate public debate. Rawls has a way of expanding the content of public reason to address such concerns—by including in public reason all those things you and I say in our justification of the conception of justice. After arguing that this (...) strategy fails, a new way of expanding public reason's content is proposed. Instead of understanding the Supreme Court—which Rawls famously calls the “exemplar” of public reason—as an institution that appeals to exogenously determined public reasons, we should understand the judicial authority in a liberal democratic society as an endogenous fountain of public reason. (shrink)