The six Republican presidents of the past 50 years had an average IQ of 115.5, with President Nixon having the highest at 155. President George W. Bush rated the lowest of all the Republicans with an IQ of 91.
The six Democratic presidents of the past 50 years had an average IQ of 156, with President Clinton having the highest IQ, at 182. President Lyndon B. Johnson was rated the lowest of all the Democrats with an IQ of 126. No president other than Carter [D] has released his actual IQ (176). Note the institute measured him at 175.
Among comments made concerning the specific testing of President G.W. Bush, his low ratings are due to his apparently difficult command of the English language in public statements, his limited use of vocabulary [6,500 words for Bush versus an average of 11,000 words for other presidents], his lack of scholarly achievements other than a basic MBA, and an absence of any body of work which could be studied on an intellectual basis.
The complete report documents the methods and procedures used to arrive at these ratings, including depth of sentence structure and voice stress confidence analysis.
"All the Presidents prior to George W. Bush had a least one book under their belt, and most had written several white papers during their education or early careers. Not so with President Bush," Dr. Lovenstein said. "He has no published works or writings, which made it more difficult to arrive at an assessment. We relied more heavily on transcripts of his unscripted public speaking."
The Lowenstein Institute of Scranton, Pennsylvania think tank includes high caliber historians, psychiatrists, sociologists, scientists in human behavior, and psychologists. Among their ranks are Dr. Werner R. Lovenstein, world-renowned sociologist, and Professor Patricia F.Dilliams, a world-respected psychiatrist. For more information on the Lovenstein Institute, go to
