This timely new collection of original essays, written by some of the most prominent scholars in the field, addresses how the recent rise in partisan politics has affected congressional-presidential relations. In each of the chapters, contributors present original research that enhances students' understanding of how partisanship affects politics at the national level. Offering insight into the interaction of the presidential & congressional branches from their respective vantage points, the essays in this volume cover a range of subjects including presidential agenda-setting in Congress, lawmaking in a partisan era, & competition between presidents & their parties over defining party identities in the public arena.