This list by Jon Perr is really great:
Here, then, are 10 Lessons for Tea Baggers:
1. President Obama Cut Your Taxes
2. The Stimulus is Working
3. First Ronald Reagan Tripled the National Debt...
4. ...Then George W. Bush Doubled It Again
5. Republican States Have the Worst Health Care
6. Medicare is a Government Program
7. Barack Obama is Not a Muslim
8. Barack Obama was Born in the United States
9. 70,000 Does Not Equal 2,000,000
10. The Economy Almost Always Does Better Under Democrats
More details and sources for each item over at Crooks & Liars.
Numbers 9 and 10 are related, I think. When there's confusion over the difference between 70,000 and 2,000,000, it's no wonder why they can't manage the economy.