Rick Perry's Top 10 Excuses from Letterman

10. "There were three reasons why I messed up last night: 1) The nerves 2) The headache and 3) Um...Uh...Oops."

9. "I don't know what you're talking about — I think things went well."

8. "I was up late last night watching Dancing With The Stars."

7. "I thought the debate was tonight."

6. "You try concentrating with Mitt Romney smiling at you. That is one handsome dude."

5. "Uh, El Nino?"

4. "I had a Five-Hour Energy Drink six hours before the debate."

3. "I really hoped it would get me on my favorite talk show, but instead, I ended up here."

2. "I wanted to help take the heat off my buddy Herman Cain."

1. "I just learned Justin Bieber is my father."