According to Vanity Fair, all ten of these comments were completely ad-libbed on stage...
10. “Are you listening Ohio and Michigan?”
9. “This Republican narrative, this alternate universe. . .”
8. “It passes the arithmetic test and more important, it passes the values test.”
7. “We gotta deal with this before it deals with us.”
6. “Democracy does not have to be a blood sport.”
5. “The old economy is not coming back.”
4. “Now you’re having a good time but this is getting serious and I want you to listen.”
3. “This is personal to me.”
2. George Washington was accused of being a “surveyor with a bad set of wooden false teeth.”
1. “You got to admit, it takes some brass to attack a guy for what you did.”
Just from a performance point of view...that's pretty amazing. I don't think either President Obama or Mitt Romney could do it.
