from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To profit from a craze; to join a trend.
US 1899. A bandwagon carried the musicians at the head of a parade or at a political rally, beckoning others to follow. When used to refer to politics, jumping on the bandwagon suggests following the crowd for the excitement of the event rather than any firm conviction in its direction. The phrase is first attested in a letter by Theodore Roosevelt in 1899: (Wiktionary)