A bipartisan consensus about the means and ends of American foreign policy is generally thought to have been part of the American political environment during the Cold War era. This consensus is also commonly thought to have been a casualty of the Vietnam War, when disagreements arose about the threat of communism, the use of American troops abroad, and relations with the Soviet Union. This article uses public opinion data from the decades following World War II pertaining to these areas of assumed change to measure whether a consensus ever existed and whether it eroded in the wake of Vietnam. The authors conclude that evidence of change can be found but that it is less dramatic in some respects than might be expected.