The National parties and their presidential candidates, with the Eastern Establishment assiduously fostering the process behind the scenes, moved closer together and nearly met in the center with almost identical candidates and platforms, although the process was concealed as much as possible, by the revival of obsolescent or meaningless war cries and slogans (often going back to the Civil War). … The argument that the two parties should represent opposed ideals and policies, one, perhaps, of the Right and the other of the Left, is a foolish idea acceptable only to the doctrinaire and academic thinkers. Instead, the two parties should be almost identical, so that the American people can “throw the rascals out” at any election without leading to any profound or extreme shifts in policy. … Either party in office becomes in time corrupt, tired, unenterprising, and vigorless. Then it should be possible to replace it, every four years if necessary, by the other party, which will be none of these things but will still pursue, with new vigor, approximately the same basic policies.
[Carroll Quigley, Tragedy and Hope: A History of the World in Our Time (New York: Macmillan, 1966), pp. 1247-1248.]