At the same time that amendment didn't pass (just to be clear). It was basically a tactic by the anti-SOPA contingent to blur the lines of legality...the pitch was "Why waste taxpayer dollars enforcing pornographic copyright? Vote for this!". I'm don't think it was raised was really a reflection of the lack of desire of the AG to enforce porn copyright...I'd guess not based on the context of it as a defensive, anti-SOPA move.

edit: it was raised by Jared Polis - http://en.wikipedia.org/wiki/Jared_Polis - who is in the anti-SOPA camp.