stump speech（n.）
"public political oratory," 1820, in Kentucky and Tennessee newspapers:
The plan ... was proposed, we are informed, in a stump speech delivered by the candidate, with loud acclamations of applause to a number of the electors of the county .... [Knoxville Register, June 27, 1820]
See stump (n.) + speech (n.). Stump oratory in reference to a style of political address is by 1809; stump-orator by 1805. In new settlements, large tree stumps were natural perches for rural orators, a custom attested in America from at least 1775. When used in the East or England, the term tended to be slighting.
Hence stump (v.) "electioneer by a political public-speaking tour, harangue from the stump, make stump speeches" (1838; stumping it is by 1836).
This meaning of the word arose from the frequent early use in the United States of a tree stump as a rostrum in open-air political meetings. It does not necessarily convey a derogatory Implication. [Century Dictionary, 1891]
该词起源时间：1820年