How about this?

[The ideas of the Frankfurt School] are very extreme examples of ways of thinking about society, both normatively and descriptively, for which I have very little sympathy, yet are closely affiliated to ideas I am receptive to. (E.g.: so far as I can see, they were all what Marxists would call "idealists", which is not a compliment, yet they claimed to be Marxists, even historical materialists!) My interest in them is thus interest in my notorious and embarrassing ideological cousins...

Not that I think pigeon-holing him is very useful for determining his views on economics or politics, let alone IQ.