Much of the debate concerning political obligation deals with the question of which, if any, moral principles could make obedience to the directives of the government a matter of obligation. What makes political obligation political has not received attention in the literature on the topic. In this article I argue that the lack of systematic reflection on what makes political obligation political is responsible for the failure of a number of influential theories of political obligation. I demonstrate this failure using (...) the consent theory of political obligation as my major example. I conclude my analysis by formulating some positive conditions that a successful principle of political obligation should satisfy. (shrink)