Dan Quayle didn't misspell potato. The sponsors of the event had the words pre-prepared, and they spelled it p-o-t-a-t-o-e. Quayle turned the card over and saw the "incorrect" spelling and corrected the child who spelled it correctly the first time. I recall the event, and saw Quayle's surprise at the alternate spelling.
You say potato, I say potatoe.
potato, potatoes