It shows that lots of different people can be related, people you wouldn't necessarily expect," Child said.

Obama has a prolific presidential lineage that features Democrats and Republicans. His distant cousins include President George W. Bush and his father, George H.W. Bush, Gerald Ford, Lyndon Johnson, Harry S. Truman and James Madison. Other Obama cousins include Vice President Dick Cheney, British Prime Minister Sir Winston Churchill and Civil War General Robert E. Lee.

Obama often jokes about his cousin Cheney at campaign appearances.

"His kinships are across the political spectrum," Child said.