You can read all the hubbub about this from Noah Kristula-Green on Daily Beast. And here a small bit of TED curator Chris Anderson’s reason (see full explanation here) on why the video was not initially posted:
At TED this year, an attendee pitched a 3-minute audience talk on inequality. The talk tapped into a really important and timely issue. But it framed the issue in a way that was explicitly partisan. And it included a number of arguments that were unconvincing, even to those of us who supported his overall stance. The audience at TED who heard it live (and who are often accused of being overly enthusiastic about left-leaning ideas) gave it, on average, mediocre ratings … Our policy is to post only talks that are truly special. And we try to steer clear of talks that are bound to descend into the same dismal partisan head-butting people can find every day elsewhere in the media.
Judge for yourself here: