Demagogue
Demagogue (?; 115) , noun
[Greek dhmagwgo`s a popular leader; commonly in a bad sense, a leader of the mob; dh^mos the people + 'agwgo`s leading, from 'a`gein to lead; akin to English act: compare French démagogue.]
A leader of the rabble; one who attempts to control the multitude by specious or deceitful arts; an unprincipled and factious mob orator or political leader.