I suspect "Whom am I to judge" is also correct, but only because of a technicality. (It was an intentional play on words, so even moreso now, who am I to judge?

I suspect "Whom am I to judge" is also correct, but only because of a technicality. (It was an intentional play on words, so even moreso now, who am I to judge?) "_Whom_ am I to judge", asking which people ought I be judgemental about, versus "_Who am I_ to judge", meaning I really ought not throw stones in glass houses.