In any event Fair Use is an affirmative defense, not a right written into SOPA. So the only "fair use" component to this discussion is "no, the legislators may

In any event Fair Use is an affirmative defense, not a right written into SOPA. So the only "fair use" component to this discussion is "no, the legislators may never suffer criminal penalties... but they still are at risk of having their domain removed from the internet until they can convince the censors to reinstate it." And each new piece of media posted to their site opens the operator up to another round of "censored until proven innocent".