Demagogue: A political leader who seeks support by appealing to popular desires and prejudices rather than by using rational argument (Wiki). Since the time of Thucydides in the 5th century BCE, historians and political analysts have warned that the great weakness of democracy is the danger posed by demagogues. Charismatic leaders excite the popular passions by using scapegoating, fearmongering, ignorance, insults, ridicule and exploiting the “Big Lie.” Once in power, they undermine the existing democratic institutions to gather unchallenged power into their hands. We will review the classic pantheon of demagogues from Cleon and Alcibiades of ancient Athens, to Mussolini and Hitler, to the 20th century Americans Huey Long and Joseph McCarthy. We will then explore whether President-Elect Trump is a demagogue and in what sense. What can the American people do to safeguard their democracy?