a person, esp. an orator or political leader, who gains power and popularity by arousing the emotions, passions, and prejudices of the people.

(in ancient times) a leader of the people.

to treat or manipulate (a political issue) in the manner of a demagogue; obscure or distort with emotionalism, prejudice, etc.

to speak or act like a demagogue.

noun

agitator , fanatic , firebrand * , fomenter , haranger , hothead , incendiary , inciter , inflamer , instigator , politician , rabble-rouser * , radical , rebel , revolutionary , soapbox orator , troublemaker , demagogism , demagogy , leader , ochlocrat , rabble-rouser , rabblerouser