As Jay Leno's tenure as host of "The Tonight Show" comes to an end, George Mason's Center for Media and Public Affairs has numbered the top 20 targets of his political jokes through all 22 years.

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Studying 43,892 Leno jokes about public figures and public affairs beginning in 1992, here's the rank, with former president Bill Clinton being the most frequent punchline:

1. Bill Clinton 4607

2. George W. Bush 3239

3. Al Gore 1026

4. Barack Obama 1011

5. Hillary Clinton 939

6. Dick Cheney 673

7. Monica Lewinsky 454

8. Bob Dole 452

9. John McCain 426

10. Mitt Romney 361

11. John Kerry 357

12. George H.W. Bush 343

13. Newt Gingrich 328

14. Sarah Palin 300

15. Ross Perot 288

15. Arnold Schwarzenegger 288

17. Joe Biden 274

18. Dan Quayle 260

19 John Edwards 229

20. Osama Bin Laden 216