Has any president not run for reelection?

Related questions

1. Could Obama run again?
2. How does the caucus process work?
3. Are primaries or caucuses better?
4. Does the vice president live in the White House?
5. How many incumbent presidents have lost?
6. Does an incumbent president have to run in the primaries?
7. How much has the Sanders campaign raised?
8. When was Donald Trump sworn in?
9. Has any president not run for a second term?
10. What is the point of a caucus?

Tags

1. #several
2. #second
3. #presidents
4. #chosen
5. #after
6. #there
7. #office
8. #choice
9. #president
10. #serving
11. #james
12. #chose
13. #elected
14. #reelection