George W. Bush
You may know him because of his dad, but you probably know him because of the turbulent time in American politics during his two terms in the early 2000s. George Bush Jr. followed in his father's footsteps in pretty much every aspect of his life. Although, G.B.Jr. did only have an IQ of 139.
James Monroe
The fifth president of the United States of America is James Monroe. He served an absurdly long term. Back then, the presidents kind of got to stick around until they weren't needed anymore. Monroe had an assumed IQ of 139.