DR COLIN FARRELLY is Associate Professor of Political Science (Cross-Appointed with Philosophy) at the University of Waterloo, Canada. Previous appointments include positions at Oxford University and the University of Manchester. Farrelly's research interests are interdisciplinary and he has published articles in peer-reviewed journals in law, philosophy, politics and bioethics. His most recent book is entitled Justice, Democracy and Reasonable Agreement (Pagrave, 2007). PROFESSOR LAWRENCE B. SOLUM is John E. Cribbet Professor of Law and Professor of Philosophy at the University