If there had never been a 22nd Amendment to the United States Constitution, of the presidents we've had since FDR, who do you think would seek an extra term, or extra terms, with nothing but ballot boxes stopping them? Clinton seems pretty obvious here to me. An unWatergated Nixon would probably attempt it as well. To really sweeten the pot, extra points go to anyone that can shoe horn an unassassinated JFK in for more than two terms.