Demagogical :: Demagogical (a.) Relating to, or like, a demagogue; factious..
Demagogism :: Demagogism (n.) The practices of a demagogue.
Demagogue :: Demagogue (n.) 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.