People like Foucault are just self-indulgent jerks who are smart enough to plausibly present their personal, situational feelings and desires as ethical positions and grand philosophical ideals.
The great danger of people like Foucault and Chomsky is that impressionable persons with less sophisticated critical thought abilities confuse the brilliance of of these men's minds with correctness.
To that extent, Moore doesn't fall into the Foucault and Chomsky categories: Moore does not possess a brilliant mind, just one that's very good at manipulation.
In short Foucault is what I like to call a brilliant idiot. That follows with the statement Orwell made that some ideas are so stupid only an intellectual would believe them. With all their gods failing miserably, radical liberals had to come up with something to justify their worthless existence. Postmodernism is just another in the line of ridiculous liberal "philosophies" they come up with every now and then to ease the boredom of modern life. Being hip is valued more than integrity or living a basic life dedicated to ones family and allegiance to one's country. That is why the "hip" John Kerry is to be preferred over the very unhip George Bush.