Medea Benjamin may have made some valid points, as did the president. But heckling often ends up working against the heckler, at least that's the way it looked from the reactions that came my way on Twitter. On the other hand, it does get a whole lot of attention from the media.
President Obama eventually became impatient with the interruptions and politely told a very persistent Medea Benjamin to STFU:
"This is part of free speech, is you being able to speak but also, you listen, and me being able to speak."