I don't get HBO, so I've never seen the show. I'm sure it is funny - I loved Seinfeld. I think the wife just hosted that "Earth to America". I didn't see that either, but it sounded like a condescending preach fest.
I get HBO; you're not missing anything.
Someone on these boards said he was in Vegas and attended that show, and that it was nothing but leftwing Bush-bashing, blaming Bush for everything from global warming to the L.A. smog. He also noted that the show was so sparsely attended, they had to move all the people up to the front to make them look like a crowd on TV.
Cedric the Entertainer was in it, and I saw him on Jimmy Kimmel, "joking" about how they were all there to raise awareness about the environment, so they were flown in on private jets and taken to the hotel in limos. Kimmel asked if they went all the way and wasted food by throwing it out the limo windows as they drove in.