According to statements in the report, there have been twelve presidents over the past 50 years, from F.D. Roosevelt to G. W. Bush who were all rated based on scholarly achievements, writings that they alone produced without aid of staff, their ability to speak with clarity, and several other psychological factors which were then scored in the Swanson/Crain system of intelligence ranking.
The study determined the following IQs of each president as accurate to within five percentage points:
 
147 Franklin D. Roosevelt (D)
132 Harry Truman (D)
122 Dwight D. Eisenhower (R)
174 John F. Kennedy (D)
126 Lyndon B. Johnson (D)
155 Richard M. Nixon (R)
121 Gerald Ford (R)
175 James E. Carter (D)
105 Ronald Reagan (R)
098 George HW Bush (R)
182 William J. Clinton (D)
091 George W. Bush (R)
 
The six Republican presidents of the past 50 years had an average IQ of 115.5, with President Nixon having the highest  
IQ, at 155. President G. W. Bush was rated the lowest of all the Republicans with an IQ of 91.  
The six Democrat presidents had IQs with an average 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.
 
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