Throughout their time in office, American presidents are often forced to choose between leading the nation and leading their party. In an earlier time when the major parties were less polarized, this leadership dilemma, while challenging, was not nearly as vexing as it is today. American presidents now find themselves with little room to maneuver, compelled to serve the Constitution on the one hand and yet caught within bitter partisan disputes and large numbers of unaffiliated voters on the other. The contributors to this volume investigate how recent presidents have navigated these...