George W. Bush falls toward the bottom of the presidential pack for intelligence. ... John Quincy Adams, the sixth president, had the highest IQ, according to the research. Before following in ... Either explicitly or implicitly, voters will weigh estimated intelligence of the 2016 candidates in their voting decisions. read more
If you mean"high" as Mensa level (IQ 132 or two standard deviations), which would be more intelligent as 98% of the population, 120 isn't high. Let's say both of them had sufficiently high IQ to succeed as presidents, which they did. read more
098 .. George HW Bush (R) 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. read more