Being There was a great movie, based on a great (and very short) book. While it was a very funny movie, I don't recall laughing out loud even once during the whole course of the film. A different kind of funny than, say, Analyze This, which was absolutely hilarious.
I agree Obama's a blank screen and I agree that it's deliberate. What I don't agree to is that anyone can project his or her own values onto the screen. I think the screen is for the left-of-centre only but the different values that can be projected onto the screen are in the range of centrist-leftist to somewhere just short of Dennis Kucinich.
Also, I don't think there's an Obama supporter anywhere who isn't acutely aware of the possibility that what Obama would write on that blank screen after the election might constitute a complete betrayal of the trust given to him during the campaign.