demagogue (noun) - an orator or leader who gains favor by pandering to or exciting the passions and prejudices of the people; a leader of the people [dem-uh-gog]
BREAKDOWN: DEM- (people) + -AGOG (leader)
demagoguery describes manipulative speech or activity meant to win political support by appealing to popular prejudices
demagogic means of, pertaining to, or characteristic of a demagogue.
“The demagogue is one who preaches doctrines he knows to be untrue to men he knows to be idiots.” —H. L. Mencken