U.S. Presidential IQ hoax. From Wikipedia, the free encyclopedia. The U.S. Presidential IQ hoax was a mid-2001 e-mail and internet hoax that purported to provide a list of estimated IQs of the U.S. Presidents from Franklin D. Roosevelt to George W. Bush.he same study estimated president Bill Clinton's IQ at 149, behind only those of Kennedy (151), Jefferson (154) and John Quincy Adams (169). Simonton's 2006 study follows earlier studies done on this subject, including a 1926 study by Catharine Cox Miles.