In 1960 you could not have convined 1% of the pop. there would ever be a Prez. like Carter or Klinton. If you proposed to write a book/novel on this you would be told, "Fiction must be believable. It won't sell."
Interesting observation. I can't imagine what would happen if a**hats like Toon or , God forbid, Jimmuh were President during the 1940s. I probably wouldn't be here since the Nazis/Japs would take over Eurasia and Jimmuh would give it to them.