The reason that The First Family even came to mind for me was that, while sitting in the doctor's office a few days ago, I picked up an semi-old copy of Entertainment Weekly in which there was an article about Vaughn Meader. It seems that, following Kennedy's assassination, Vaughn began a decline from the heights of fame and popularity that is nearly unmatched in weirdness and rapidity in the annals of popular culture. I had no idea about what had happened to him until I read that.
http://www.geocities.com/Broadway/Stage/1985/
The link above tells some of the same story, although it omits much of the scary details, including his messianic phase and his belief that he was actually a small blue rabbit (LSD - what a drug!).