The poll was conducted by Intercollegiate Studies Institute. There was a thread on FR with a link to an aol article that had information on the poll and gave a sample of questions contained on the test. I think I saw the thread on the 14th, The aol article was titled Opinion: Elected Officials Flunk Constitution Quiz.
Here is the link to the thread on FR: http://www.freerepublic.com/focus/f-bloggers/2656921/posts