The sudden resurgence of interest in the emotions that has recently overtaken analytical philosophy has raised a range of questions about the place of the passions in established explanatory schemes. How, for example, do the emotions fit into theories of action organized around beliefs and desires? How can they be included in analyses of the mind developed to account for other mental states and capacities? Questions of this general form also arise within political philosophy, and the wish to acknowledge their importance and find a space for them has led to some fruitful developments. Among these are a new sensitivity to ways in which attributions of emotion can create and sustain unequal power relations, an interest in the underlying emotional capacities that make politics possible, a concern with the kinds of emotional suffering that politics should aim to abolish, and analyses of the emotional traits it should foster. While these and comparable explorations have enormously enriched contemporary political philosophy, a great deal of mainstream work continues to ignore or marginalize the emotions, so that their place remains uncertain and obscure. There is no consensus as to what kind of attention should be paid to them, or indeed whether they deserve any systematic attention at all. This is a curious state of affairs, because it was until quite recently taken for granted that political philosophy and psychology are intimately connected, and that political philosophy needs to be grounded on an understanding of human passion. In this essay I shall first consider why political philosophers ever rejected this set of assumptions.