20 worst figures in American history

RightWingNews ran two surveys to create a right wing and a leftist version of the “20 worst figures in American history.”
I decided to make my own list, shown below. My take on the top 20 greatest Americans is coming next.

The list is biased towards more recent history due to my limited knowledge of U.S. history, but here goes:

14-20:
John Dewey, Michael Moore, Bill Clinton, Ted Kennedy, Noam Chomsky, Jane Fonda, Lee Harvey Oswald
13.) Jesse Jackson
12.) Hillary Clinton
11.) Jimmy Carter
10.) Lyndon Johnson
9.) J. Edgar Hoover
8.) Timothy McVeigh
7.) Alger Hiss
6.) Aldrich Ames
5.) Benedict Arnold
4.) Richard Nixon
3.) Aaron Burr
2.) Franklin Delano Roosevelt
1.) Ethel and Julius Rosenberg