David Rice Atchison
David Rice Atchison was a mid19th century Democratic United States Senator from Missouri. He served as President pro tempore of the United States Senate for six years. He is best known for the claim that for one day he may have been Acting President of the United States. This belief, however, is dismissed by nearly all historians, scholars, and biographers.
Atchison was born to William Atchison in Frogtown , which is now part of Lexington, Kentucky. He was educated at Transylvania University in Lexington, where his classmates included five future Democratic senators . Atchison was admitted to the Kentucky bar in 1829.
Source: Wikipedia