Why do politicians frequently heed the preferences of small groups of citizens over those of the general public? Breaking new theoretical ground, Benjamin Bishin explains how the desires of small groups, which he calls 'subconstituencies', often trump the preferences of much larger groups. "Tyranny of the Minority" provides a 'unified theory of representation', based in social psychology and supported by extensive analyses of legislators' voting behavior, that explains how citizens' knowledge and participation affects candidates' behaviour in campaigns and legislators' behaviour in Congress....