Traveling again, and chanced to pick up Southwest Airlines' Spirit magazine. That's where I found this tidbit:

79: Percentage of Americans age 18 and older who can identify Nike's "Just Do It" slogan.

47:Percentage who can identify the right to life, liberty, and the pursuit of happiness as set forth in the U.S. Constitution.

Personally, I'm hoping the other 53% realized that there is no constitutional right to "life, liberty, and the pursuit of happiness," since the phrase actually came from the Declaration of Independence. Sheesh -- if you're going to make fun of ignorant people, you should at least make sure you know what you're talking about!