Founded in 1947, the Americans for Democratic Action (ADA) was at the forefront of the movement toward "Vital Center" liberalism and over the next two decades emerged as the most forceful advocate of many ideas cherished by liberals. With such prominent members as Walter Reuther, David Dubinsky, Eleanor Roosevelt, John Kenneth Galbraith, Arthur M. Schlesinger, Jr., and James Loeb among its ranks, the ADA strove to strike a balance between its commitment...