Possible Clues:

• President who later served as chief justice
• 27th U.S. president
• Only chief justice who was a former president
• Only U.S. president also to serve as chief justice
• Only president to be a Supreme Court justice
• President after Roosevelt
• Prior president who swore in two subsequent presidents
• Last president with a mustache
• 300-lb. president
• "Dollar Diplomacy" president