Second United States president.

Sixth United States president.

21st United States president.

46th United States president.

Biden also served as President Barack Obama's vice president. Prior to that he served in the Senate from 1973 - 2009.

15th United States president.

41st United States president.

43rd United States president.

39th United States president.

22nd and 24th United States president.

42nd United States president.

30th United States president.

34th United States president.

13th United States president.

38th United States president.

20th United States president.

18th United States president.

29th United States president.

23rd United States president.

Ninth United States president.

19th United States president.

31st United States president.

Seventh United States president.

Third United States president.

Jefferson is generally recognized as the author of the Declaration of Independence.

17th United States president.

36th United States president.

35th United States president.

16th United States president.

Fourth United States president.

Also...

25th United States president.

Fifth United States president.

37th United States president.

44th United States president.

He was elected in 2008, and re-elected in 2012.

14th United States president.

11th United States president.

40th United States president.

32nd United States president.

26th United States president.

27th United States president.

12th United States president.

33rd United States president.

45th United States president.

10th United States president.

Eighth United States president.

First president of the United States.

28th United States president.