22. I Will Not Plant SubliminAL MessaGORE (Season 12, Episode 2 - A Tale Of Two Springfields)
This episode aired on November 5, 2000, just two days before the U.S. Presidential election, when George W. Bush defeated Al Gore to become President. Though Fox is a notoriously right-wing network, the show's writers swing far towards the left, and as such it's no surprise that they included this sledgehammer-subtle advertisement for Gore at the start of the episode. Props to Fox for not interfering and allowing it to air, though.