Diana Mutz's book charts a new course and introduces what might become known as Mutz's paradox. As the title suggests, two major variants of democratic theory are at odds. Mutz argues it is not possible to promote political participation and lively exchanges with "cross-cutting" discussants who hold dissimilar views. In other words, even though citizens tend to be more tolerant and aware of reasons for dissent when they hear from others who disagree, few people actually encounter opposing positions and those who do become less likely to act politically. This is a nuanced but stunning message that is delivered in a persuasive manner.