What is a demagogue?
A leader who obtains power by means of impassioned appeals to the emotions and prejudices of the populace. A leader of the common people in ancient times. A rabble-rouser.
Note...
A demagogue is a political leader who seeks support by appealing to popular passions and prejudices. The word is derived from the Greek words δῆμος (demos, meaning people) and ἀγωγός...