"Jimmy Carter, 39th President of the United States is your 15th cousin."
I am descended from most (if not all) of the same people -- some, like William the Conqueror and his descendant, King John I Lackland -- several times over.
Almost (if not all) every U S. President is related to each other, and I am related to almost every one of them, if not all.
I believe that if a person has Colonial American ancestry, they fit that profile, and the more Colonial American ancestry, the truer that is.
(Yes, I believe there IS -- or at least WAS -- a "bloodline" requirement for U.S. presidents.)
After all, we are descended fairly recently from only a few thousand people, and those few thousand had to marry SOMEBODY!
A fun fact:
The family of Jimmy Carter's cousin, Hodding Carter, has lived in my hometown of Hammond, LA for a long time.
My mother's great-grandfather, Leroy Thomas, was a founder, and streets there are named for him.