Possible Clues:

• "O Captain! My Captain!" prez
• His Memorial statue was completed in 1920
• *U.S. leader who said 'Do I not destroy my enemies when I make them my friends?'
• Prez who delivered a famous address on Nov. 19, 1863
• Political leader who patented a system to alter the buoyancy of steamboats
• Automotive president?
• First president born outside the original 13 colonies
• Union man?