"... Carter himself later said that, while he had considered the object to be a UFO—on the grounds it was unexplained—his knowledge of physics had meant he had not believed himself to be witnessing an alien spacecraft." Can you imagine that someone this clear-headed was ever the President of the United States?
Obama was erudite and clear headed. Clinton and Bush I were fine too.
But overall, a pretty middling presidency in terms of actual accomplishments.