demagogue (n.)

• agitator
• agitprop
• catalyst
• debate
• debater
• firebrand
• fomenter
• harangue
• haranguer
• hothead
• incendiary
• inciter
• instigator
• mischief-maker
• mouth
• orate
• panelist
• provocateur
• provoker
• rabble-rouser
• rant
• ranter
• read
• ringleader
• rodomontade
• rouser
• speaker
• speechifier
• speechmaker
• spiel
• spokesman
• spokeswoman
• spout
• spouter
• talker
• troublemaker
• tub-thumper
• urger