This says more about the public school system than it does about Presidents.
Muleteam1
"This says more about the public school system than it does about Presidents."
-Exactly. The Gallup Organization and I have wholly different views of what is the definition of an "adult American". It looks to me like they took this poll in the express line at WalMart. Can you spell 'Least Common Denominator'. I didn't think so.
One last comment. No poll on the greatest presidents should be taken seriously if the rating of any presidency is based on the test subjects' living memory. Your place in history is not settled until it actually becomes history (the time before present memory).