英语词源字典 - 在线词源网站

barnstorm (v.)[barnstorm 词源字典]: 1815, in reference to a theatrical troupe's performances in upstate New York barns (usually featuring short action pieces to suit vulgar tastes); extended 1896 to electioneering, 1928 to itinerant airplane pilots who performed stunts at fairs and races. Related: Barnstormed; barnstorming.[barnstorm etymology, barnstorm origin, 英语词源]
caucus (n.): "private meeting of party leaders," 1763, American English (New England), perhaps from an Algonquian word caucauasu "counselor, elder, adviser" in the dialect of Virginia, or from the Caucus Club of Boston, a 1760s social & political club whose name possibly derived from Modern Greek kaukos "drinking cup." Another old guess is caulker's (meeting) [Pickering, 1816], but OED finds this dismissable.
caucus: "This noun is used throughout the United States, as a cant term for those meetings, which are held by the different political parties, for the purpose of agreeing upon candidates for office, or concerting any measure, which they intend to carry at the subsequent public, or town meetings." [John Pickering, "A Vocabulary, or Collection of Words and Phrases Which Have Been Supposed to be Peculiar to the United States of America," Boston, 1816]

The word caucus, and its derivative caucusing, are often used in Boston. The last answers much to what we stile parliamenteering or electioneering. All my repeated applications to different gentlemen have not furnished me with a satisfactory account of the origin of caucus. It seems to mean, a number of persons, whether more or less, met together to consult upon adopting and prosecuting some scheme of policy, for carrying a favorite point. [William Gordon, "History, Rise, Progress, and Establishment of the Independence of the United States of America," London, 1788]
electioneer (v.): 1760 (implied in verbal noun electioneering), from election, probably on model of auctioneer, as the verb engineer was not yet in use.