Who was the smartest US President?

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This is my brother's assignment. Years way back an Institute claimed to have analyzed the IQ's of the Us Presidents from the last 50years. Bill Clinton's the highest 188. While George W. Bush ha the lowest 91. An interesting study for the democrats. But the Lovenstein Institute who claimed it does not exist. So, who was America's Smartest US President? For you. It doesnt have to be in scores, Doesn't necessarily be a test. But the things that he does and love for his country.