That's My Bush was set for a second season, then 9/11 happened and it was cancelled.
Correction: cancelled in August 2001, then they wrote a movie plot that was going to be filmed in 2002 which was cancelled. Not sure why I remember this one, it was by the South Park guys at a time when I was not watching TV at all. Looking at the episode list, I don't have a recollection of any of those. One of the old roommates was a massive South Park Fanatic, so I must have picked it up from her.