Book excerpt: "The significance of this account should be clear. If, as economists frequently assert, proper diagnosis of the disease is a crucial prerequisite to treatment, then the design of appropriate democratic institutions depends critically on a coherent analysis of the way the electoral process works and the perversities to which it is prone. The claim is that the interest-based account incorrectly diagnoses the disease. Accordingly, this book ends with an account of the institutional protections that go with expressive voting."--BOOK JACKET.