There are a lot of people in high places who DID read Montagu when they were in college, or heard about him there. His ideas are part of their worldview, just as Marx's views are.
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.