Richard Mentor Johnson ( October 17 , 1780 or 1781 - November 19 , 1850 ) was the ninth Vice President of the United States , serving in the administration of Martin Van Buren ( 1837-1841 ) .
Richard Mentor Johnson ( October 17 , 1780 - November 19 , 1850 ) was the ninth Vice President of the United States , serving with President Martin Van Buren .