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As Moyers' leave-taking approaches, rumors have blossomed that McNamara may leave the Pentagon to become the President's executive assistant, with powers akin to those that Sherman Adams exercised with flinty authority under Dwight Eisenhower. That prospect is, at best, remote. McNamara and Johnson are almost certainly too strong-willed to operate harmoniously under one roof. With the Potomac River between them, they get along swimmingly.