I believe Ted Bundy had a higher IQ.
There are 4 ingredients in making of a successful president.
1. Thorough understanding of what makes economy tick.
2. Thorough understanding of world geo-political situation.
3. Patriotism, Hard work, long hours and dedication to the job.
4 High level of common sense, IQ, honesty & education.
Very few individuals possess all these qualities. But some possess more than others.