Those who seek to accurately gauge public opinion must first ask themselves: Why are certain opinions highly volatile while others are relatively fixed? Why are some surveys affected by question wording or communicative medium (e.g., telephone) while others seem immune? In Hard Choices, Easy Answers, R. Michael Alvarez and John Brehm develop a new theory of response variability that, by reconciling the strengths and weaknesses of the standard approaches, will help pollsters and scholars alike better resolve such perennial problems. Working within the context of U.S. public opinion,...