A demagogue. Sydney Smith in 1802 uses the phrase rabble-rousing words. (N.E.D.)
1843. Nothing surpasses the munificent promises and at the same time the external and grovelling humility of a genuine rabblerouser, just before an election.B. R. Hall (Robert Carlton), The New Purchase, i. 211.
a. 1905. (Arkansas.) Dialect Notes, iii. 152.