A 2006 study analyzing presidential IQs by Dean Keith Simonton of U.C. Davis appeared in the journal Political Psychology. Simonton's study analyzed the results of varied and often subjective historical material using the tools of historiometry. It estimated IQs for all US presidents, and validated the headline of the hoax, which stated Bush's was the lowest of any president in the last 50 years, though it estimates his IQ considerably higher (by more than two standard deviations) than the 91 suggested in the hoax report.
It rated G.W. Bush second to last since 1900, with an estimated IQ of 119 (the estimates ranged from 111 to 139). Bush's estimated IQ was less than those estimated for Grant (120), Monroe (124), and Harding (124). The same study estimated president Bill Clinton's IQ at 149, behind only those of Kennedy (151), Jefferson (154) and John Quincy Adams (169).[9]