Bipartisanship has become so associated with the conduct of foreign policy that partisanship has virtually been forgotten. In this persuasive study of senatorial politics, Malcolm E. Jewell reasserts the importance of partisanship, arguing that increased party responsibility is the best guarantee for the establishment of sound policy and for the continued support of policy once established. The author bases his conclusions on a study of the Senate during the Truman and Eisenhower administrations.