A demagogue (//) or rabble-rouser is a political leader in a democracy who appeals to the emotions, prejudices, and ignorance of the less-educated people of a population in order to gain power and promote political motives. Demagogues usually oppose deliberation and advocate immediate, violent action to address a national crisis; they accuse moderate and thoughtful opponents of weakness. Demagogues have appeared in democracies since ancient Athens. They exploit a fundamental weakness in democracy: because ultimate power is held by the people, nothing stops the people from giving that power to someone who appeals to the lowest common denominator of a large segment of the population.
History and definition of the word 
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The word demagogue, meaning a leader of the common people, first arose in ancient Greece, originally with no negative connotation, but eventually came to mean a troublesome kind of leader who occasionally arose in Athenian democracy. Even though democracy gave power to the common people, elections still tended to favor the aristocratic class, which favored deliberation and decorum. Demagogues were a new kind of leader who emerged from the lower classes. Demagogues relentlessly advocated action, usually violent—immediately and without deliberation. Demagogues appealed directly to the emotions of the poor and uninformed, pursuing power, telling lies to stir up hysteria, exploiting crises to intensify popular support for their calls to immediate action and increased authority, and accusing moderate opponents of weakness or disloyalty to the nation. All politicians in a democracy must make occasional small sacrifices of truth, subtlety, long-term concerns, or other matters that don't have immediate popular impact or else they will lose the popular support which is the base of their political power. Demagogues do these things relentlessly and without self-restraint.
Demagogues have been found in democracies from Athens to the present day. Democracies are instituted to ensure freedom for all and popular control over government authority; through their popular appeal, demagogues exploit the freedom secured under democracy to gain a level of power for themselves that overrides the rule of law, thereby undermining democracy. The Greek historian Polybius thought that democracies are inevitably undone by demagogues. He said that every democracy eventually decays into "a government of violence and the strong hand," leading to "tumultuous assemblies, massacres, banishments."
Throughout its history, the word demagogue has been used to disparage any leader thought to be manipulative, pernicious, or bigoted.
Famous historical demagogues 
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First, after the failed revolt by the city of Mytilene, Cleon persuaded the Athenians to slaughter not just the Mytilenean prisoners, but every man in the city, and to sell their wives and children as slaves. The Athenians rescinded the resolution the following day when they came to their senses.
Second, after Athens had completely defeated the Peloponnesian fleet and Sparta could only beg for peace on almost any terms, Cleon persuaded the Athenians to reject the peace offer.
Third, he taunted the Athenian generals over their failure to bring the war in Sphacteria to a rapid close, accusing them of cowardice, and declared that he could finish the job himself in twenty days, despite having no military knowledge. They gave him the job, expecting him to fail. Cleon shrank at being called to make good on his boast, and tried to get out of it, but he was forced to take the command. In fact, he succeeded—by getting the general Demosthenes to do it, now treating him with respect after previously slandering him behind his back. Three years later, he and his Spartan counterpart Brasidas were killed at the Battle of Amphipolis, enabling a restoration of peace that lasted until the outbreak of the Second Peloponnesian War (conceptualized by some historians as the second phase of a single Peloponnesian War).
Modern commentators suspect that Thucydides and Aristophanes exaggerated the vileness of Cleon's real character. Both had personal conflicts with Cleon, and The Knights is a satirical, allegorical comedy that doesn't even mention Cleon by name. Cleon was a tradesman—a leather-tanner; Thucydides and Aristophanes came from the upper classes, predisposed to look down on the commercial classes. Nevertheless, their portrayals define the archetypal example of the "low-born demagogue" or "rabble-rouser": born into the lower classes, hating the nobility, uneducated, despising thought and deliberation, ruthless and unprincipled, bullying, coarse and vulgar in style, rising in popularity by exploiting a national crisis, telling lies to whip up emotions and drive a mob against an opponent, deriving political support primarily from the poor and ignorant, quick to accuse any opponent of weakness or disloyalty, eager for war and violence, inciting the people to terrible acts of destruction they later regret.
Alcibiades convinced the people of Athens to attempt to conquer Sicily during the Peloponnesian War, with disastrous results. He led the Athenian assembly to support making him commander by claiming victory would come easily, appealing to Athenian vanity, and appealing to action and courage over deliberation. It should be noted, however, that Alcibiades's expedition could have succeeded if he was not denied from command due to the political manoeuvers of his rivals.
Gaius Flaminius 
Gaius Flaminius was a Roman consul most known for being defeated by Hannibal in the battle of Lake Tresimene during the second Punic war. Hannibal was able to make pivotal decisions during this battle because he understood his opponent. Gaius Flaminius was described as a demagogue by Polybius, in his book the Rise of the Roman Empire. "...Flaminius possesed a rare talent for the arts of demagogy..." Because Flaminius was thus ill suited, he lost 15,000 Roman lives, his included, in the battle.
Father Coughlin 
An American Catholic priest, Father Charles Coughlin was one of the first to use radio to reach a mass audience in the 1930s, and was close friends with Huey Long. While initially a vocal supporter of Franklin D. Roosevelt and his New Deal, he later became a harsh critic of Roosevelt. Coughlin's themes eventually became increasingly antisemitic and supportive of assorted aspects of the fascist policies of leaders like Benito Mussolini.
Adolf Hitler 
Adolf Hitler led the Nazi party to power in Germany by appeals to ethnic pride and conspiracy theories that blamed Jews for the nation's economic troubles. He instituted government control over the news media, and used his charisma and great oratorical skills to lead Germany into a war aimed at expanding its territory.
Joseph McCarthy 
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Joseph McCarthy was a U.S. Senator from the state of Wisconsin from 1947 to 1957. Though a poor orator, McCarthy rose to national prominence during the early 1950s by proclaiming that high places in the United States federal government and military were "infested" with communists, contributing to the second "Red Scare". Ultimately his inability to provide proof for his claims led him to be censured by the United States Senate in 1954, and to fall from popularity.
See also 
- "demagogue, n.". Oxford English Dictionary. June 2012. Retrieved June 13, 2012.
- Ostwald, Martin (1989). From Popular Sovereignty to the Sovereignty of Law. University of California Press. p. 201. ISBN 0520067983.
- "Defining the Demagogue". Demagogue: The Fight to Save Democracy from Its Worst Enemies. Macmillan. 2009. pp. 32–38. ISBN 0230606245.
- Ceasar, James W. (2011). "Demagoguery, Statesmanship, and Presidential Politics". Designing a Polity: America's Constitution in Theory and Practice. Rowman & Littlefield. pp. 75–118. ISBN 1442207906.
- "Democracy's Own Worst Enemy". Demagogue: The Fight to Save Democracy from Its Worst Enemies. Macmillan. 2009. pp. 38–40. ISBN 0230606245.
- Michael Grant, Ancient Historians, p. 98, pp. 110–111. Barnes & Noble Publishing (1994). ISBN 1-56619-599-3
- Aristophanes, The Knights. Here is an old free version translated by William Walter Merry, Clarendon Press (1902). The translator says on p. 5:
"The picture of Cleon the demagogue has been painted for us in the comedies of Aristophanes, and in the graver history of Thucydides. On the strength of these representations, he is commonly taken as the type of the reckless mob-orator, who trades upon popular passions to advance his own interests."
- Polybius, the Rise of the Roman Empire
- Richard Rovere, Senator Joe McCarthy, Methuen Books (1959); reprinted by the University of California Press (1996). ISBN 0-520-20472-7
- The book describes McCarthy's tactics, compares him to the ancient demagogues and previous U.S. demagogues, and concludes that McCarthy was the first "national demagogue" in the U.S. (as opposed to demagogues whose influence is limited to a small area like a town or county).
- Tom Wicker, Shooting Star: the Brief Arc of Joe McCarthy, Houghton Mifflin Harcourt (2006) ISBN 0-15-101082-X
"Joe McCarthy may have been the most destructive demagogue in American history." p. 5
"McCarthy's Senate colleagues voted sixty-seven to twenty-two to censure him for his reckless accusations and fabrications." back cover
- Haynes Johnson, The Age of Anxiety: McCarthyism to Terrorism, Houghtin Mifflin Harcourt (2006). ISBN 0-15-603039-X
"Joe McCarthy was a demagogue, but never a real leader of the people." p. 193
"McCarthy represented what Richard Hofstadter called 'the paranoid style of American politics.'" p. 193–4
"While he never approached the importance of a Hitler or a Stalin, McCarthy resembled those demagogic dictators by also employing the techniques of the Big Lie." p. 194
- History News Network - What Qualifies as Demagoguery?
- Mayer, Michael (2007). The Eisenhower Years. Infobase Publishing. p. 477. "Unlike most demagogues, McCarthy did not give stem-winding, highly emotional speeches. Rather, he spoke in a monotone, even as he made his most outrageous charges. The delivery lent credence to his accusations, in that they seemed to be unemotional and therefore "factual.""
- Harold Barrett (1991). Rhetoric and Civility: Human Development, Narcissism, and the Good Audience. SUNY Press. p. 108. ISBN 0791404838.
- The dictionary definition of demagogue at Wiktionary