They jumped it awhile ago, imo. I stopped watching new episodes half way through the episode where the family went to "free speech jail" with Michael Moore, Sean Penn, and the Dixie Chicks.
The day before yesterday was the episode where Bush 41 moves in across the street and Homer and GHWB keep pulling pranks on each other, complete with George doing donuts on the Simpsons lawn. It's a really cute episode. My husband and I both wondered if that episode was made this season what it would be like? I'm guessing it wouldn't be nearly as cute.
That Bush 41 episode is one of my favorites. I love it when Gerald Ford moves in at the end.
Gerald Ford: "Tell me, Homer, do you like football?"
Homer Simpson: "Yes, Mr. President!"
Ford: "Do you like Nachos?"
Homer: "Yes sir!"
Ford: "How about you come over and watch the game, and we'll have some nachos. And then, some beer."
Then they both fall down and say "D'oh!"