The writing of this book benefitted greatly from a number of persons to whom I would like to express my thanks. My friends and colleagues in both the Philosophy and Political Science Departments at Penn State University have been particularly helpful through the process of writing this book, as have been numerous other dear friends who always expressed interest and support and made valuable suggestions on various aspects of the book. An anonymous reader for Routledge gave me excellent suggestions (and induced me to rewrite a section of Chapter 3 in a way that greatly improves the discussion), and the editorial staff for the press was immensely helpful throughout the (alas extended) process. Lori Watson read the entire manuscript and offered countless valuable suggestions, both stylistic and substantive; I want to express my gratitude for her time and thoughtfulness. Thanks also to Ella Campi and Daniel Campos for their help with gathering bibliographical materials. Finally, as with all of my endeavors, Mary Beth Oliver has been a tireless supporter and a constant inspiration. I thank her here deeply (and again).