Do we have any obligations to our political society? If so, how should they be understood and explained? Political philosophers since Socrates have grappled with these questions, and have reached a diverse range of conclusions. Following on from the success of the first edition, this substantially revised book provides a thorough assessment of the major theories of political obligation and explores the strengths and weaknesses of each. Horton argues against the denial that we have political obligations and defends an associative theory, according to which the nature of one's political obligations are determined through one's membership of 'a particular polity. Alongside fully updated chapters on theories such as anarchism, voluntarism and utilitarianism, this edition also includes new discussions of the Samaritan, 'joint commitment' and pluralist theories of political obligation.