ABSTRACT In a democracy what people think matters. Political philosophers are mostly democrats. They often justify deliberative and participatory democracy. And yet when it comes to philosophizing they often turn a blind eye to what people think; they sometimes even express profound doubts about what people think and about consulting the public. I call this the political philosophy gap. It has been justified in several ways. In this paper I first consider and dismiss the most common justifications. I then suggest (...) a democratic and an epistemological reason why political philosophers should consider what people think when they formulate their theories. I put forward a proposal for a method of doing so, which I call public reflective equilibrium, and which consists of four stages of research and philosophy. Finally, I suggest that not only is it doable, but it has a potential to contribute a lot to contemporary political philosophy. It should not come instead of traditional ways of conducting political philosophy but as an additional, perhaps more political, method of political philosophy. (shrink)