Stump-orator or Stump-oratory

one who harangues the populace from the stump of a tree, or other elevation. [U. S.]—Stump-oratory, an electioneering speech from a stump, or other elevation. [U. S.]—To take the stump, or to stump it, to make public addresses for electioneering purposes;—a phrase derived from the speaker's originally mounting the stump of a tree, in the Western States or in the backwoods, in making his address. [U. S.]