Don’t forget George Washington, whose formal classroom education ended with the equivalent of grade school.
Also don't forget Rick Perry, Tim Pawlenty, and Paul Ryan.
Perry intended to go the Vet school, Pawlenty to dental school, and Ryan to Med school.
All three had problems in their science courses(Organic Chemistry probably), had to change their major, which led them into a career in politics.
US Presidents who did not finish college:
1. George Washingon
2. William Henry Harrison
3. James Monroe
4. Andrew Jackson
5. Martin Van Buren
6. Zachary Taylor
7. Millard Fillmore
8. Abraham Lincoln
9. Andrew Johnson
10. Grover Cleveland
11. Harry Truman
(in no particular order)