Well, considering that Beck's rally didn't really say anything, didn't really have a purpose, or didn't really have a call to action, I can't see how this rally can really go wrong. It was kind of intentional on Beck's part, by making it non-political. In a general sense, I guess it called to "restore traditional American values." But it was decidedly targeted at his audience, which includes many Tea Partiers. If anything, Beck's rally served to galvanize his audience. His rally was non-political (ostensibly), but it could be argued that it was a political move by Beck.
If you think about it, the underlying message of this upcoming rally is kind of the same. It's called "Restoring Sanity," but this is really about restoring honour too, because what is honour?
Wikipedia says that honour is about honesty, respect, integrity, or fairness. I think that's what Jon Stewart is getting at in the way he knows best.