My thanks to the Library of Law and Liberty for inviting me to respond to David Upham’s review of my new book, The Fourteenth Amendment and the Privileges and Immunities of American Citizenship (Cambridge U. Press 2014). Thanks also to Prof. Upham for taking the time to review the book and his gracious acknowledgement that it constitutes a step forward in our understanding of the Privileges or Immunities Clause. Unfortunately, in some of his more critical comments, it appears that Upham has misunderstood the theory of the book and (worse) missed much of the evidence presented in the book.