Everything about this video is amazing. The most obvious thing to notice is the fact that a Republican audience's immediate response to the question, "What about the climate?" is boos and chants of "U!S!A! U!S!A!"
But look at Mitt Romney's fucking face when the protester kicks in. His smile freezes in place, his eyes go dead, and he starts nodding and oscillating. He has no idea what he's supposed to do. He has no idea what he's supposed to say. So he just circles his head back and forth, like a busted Roomba, with that fucking smile plastered on his face. Then, after an appropriate amount of time passes, he just starts his speech where he left off. He can't even acknowledge what just happened. There's nobody home behind that face, which means that Romney can't answer the question, so he just lets the ravenous, angry crowd answer for him.