You're gonna love this . Remember the weird green screen behind McCain as he was speaking last night? As his speech went on, we realized it was grass - grass from a larger photo of a house or some big mansion or something. In fact, the picture was of Walter Reed. No, not Walter Reed Army Medical Center where injured troops are treated - though that was clearly McCain's intent, to use our injured troops as a political prop (just as last night they dared show footage of the planes crashing into t