So what? Clinton probably read Keynes, but by the time he became POTUS Keynesian economics was nevertheless surpassed and even a 'Rat like The Rapist wasn't stupid enough to pretend otherwise. Montagu is at best "quaint". Kinda like Peter Max posters.
Did Clinton give up Montagu's notion of the equality of the races? A decent man like Richard Russell never abandoned the racist notions he inbibed with his mother's milk. I dare say that most people never abandon the ideas they learned as young people. The Jesuits managed to counter the Reformation by setting up a chain of secondary schools for the European aristocracy. The notion was; Catch them when they are young, and they are yours forever. That is, except for rebels like Voltaire.