Polsby and Wildavsky’s classic text argues that the institutional rules of the presidential nomination and election processes, in combination with the behavior of the mass electorate, structure the strategic choices faced by politicians in powerful and foreseeable ways. We can make sense of the decisions made by differently situated political actorsincumbents, challengers, Democrats, Republicans, consultants, party official, activists, delegates, journalists, and votersby understanding the ways in which their world is organized by incentives, regulations, events, resources, customs, and opportunities.