Richard Nixon
Nixon was a crook, he got caught, and he got impeached. He was the 37th president of the United States, despite being the vice just three terms earlier. He had an alleged IQ of 132, the same as his boss, Dwight D. Eisenhower.
James K. Polk
Polk was one of those older presidents. He was a farmer, and he helped develop the standardized voting process around the agricultural structure. We still use that voting process today. He had an alleged IQ of 130.2.