Andrew Johnson
Johnson took over for Lincoln after he was assassinated. Johnson quickly restored seceded states to the American Union without providing slaves with the protections that Lincoln had passed during the time he was in office. He was also the president that purchased Alaska. He had an IQ of 125.
Warren G. Harding
Harding was the 29th president of the United States. He had an impressively high approval rating until after his death when news of covered up scandals that he conducted in the office were brought to light. Harden is considered to be one of the worst presidents in American history, according to historical rankings. He also had an IQ of 124.