Here's the official media presentation of same: "Just who does Jon Stewart think he is?" The Washington Post:
[T]he similarities to Beck's rally are just the sort of thing Stewart himself would satirize on his show if, of course, it weren't his rally and his TV show in the first place. In his few pre-rally comments, Stewart has reached for some of the broad values and high-minded themes that Beck's did -- civility, decency, making America better -- though admittedly with fewer religious allusions and more comic panache.....ADDED: Stewart is, of course, attempting to help the Democrats. But don't Democrats worry about losing control of the imagery? I assume the crowd Stewart pulls in will not give off finely tuned niceness vibes and, in all likelihood, they will project a much more left-wing image than Democrats would like to be identified with.
[A] mass gathering with the stated aim of being nice. Is that a role a satirist can really play?