A leader who uses a number of underhanded political techniques in order to gain power, including: warmongering, fear, censorship, propaganda, nationalism, xenophobia, hateful rhetoric, false logic, and blatant lies. Uses the blind, patriotic support of the people to institute a corrupt and oppressive government.

1.

A leader who obtains power by means of impassioned appeals to the emotions and prejudices of the populace.

2.

A leader of the common people in ancient times.

3.

A rabble-rouser.

Note that in modern usage the word is derogatory (negative).