Update: Aaaaagh, they've removed it. For the benefit of those who hadn't seen it, it was a video of children, in an affluent liberal city, who had literally been taught to sing songs of praise about Obama. "Obama's gonna save us" is a sample lyric.
Update 2: It may have been removed but the video is described here:
The video was promoted on Obama's presidential website in an August 20 post. "What the children and a few adults accomplished in a few hours on a Sunday afternoon embodies the nature of the Obama campaign: its grassroots inspiration, its inclusiveness, its community building," Obama's campaign site said of the video.
The song begins with a young girl singing alone, "We’re gonna spread happiness/ We’re gonna spread freedom/Obama’s gonna achange it/Obama’s gonna lead ‘em/We’re gonna change it/And rearrange it/We’re gonna change the world."
The other children then join in, chanting Obama's campaign mantra "Yes, we can, yes, we can."
Update 3: Rejoice, the video is back up, as is Reason TV's own version: