Best and worst are obviously subjective. Many fault Nixon and he was perhaps even more lacking in ethics than most,but he had a solid foreign strategy. Carter was honest, unlike any who followed him, but was trapped by a n oil embargo and a hsotage crisis. He might have been dubed a hero if his rescue mission had suceeded.

In my opinion the prsidnedt I have seen in action I would rank from best to worst;

Clinton
Reagan
Nixon
Kennedy
Ford
Bush the Ist
Carter
Bush the lsat. (God I hope he's the last!)
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No huevos no pollo.