Leno's 21-year run as host of "The Tonight Show" will come to an end tomorrow night, so, the Center for Media and Public Affairs put together a report on the most frequent targets of Leno's monologue jokes . . . from 1992 up through last month.

Here's the Top 10:

1. Bill Clinton, 4,607 jokes

2. George W. Bush, 3,239 jokes

3. Al Gore, 1,026 jokes

4. Barack Obama, 1,011 jokes

5. Hillary Clinton, 939 jokes

6. O.J. Simpson, 795 jokes

7. Dick Cheney, 673 jokes

8. Michael Jackson, 505 jokes

9. Monica Lewinsky, 454 jokes

10. Bob Dole, 452 jokes