If there’s one thing that the 2012 campaign has taught us about Ron Paul, it’s that he is a bald-faced liar. Not just a run-of-the-mill liar like most politicians, but a liar so shameless that only the most slavish of devotees could maintain respect for him. Brian Doherty, a senior editor of Reason magazine and the author of a well-received book about the libertarian movement, is just such a follower. Unfortunately, what could have been a fascinating peek into the leader of a fringe political movement ends up being little more than a love letter to Paul that, like all love letters, exhibits a willful blindness toward the glaring defects in the object of the author’s...