on the bandwagon, get

get on the bandwagon

To join, follow, or support someone or something only after it is successful or popular. I can't stand these people who just get on the bandwagon after a win. Where were they last year when the team was terrible? A: "I thought your mom hated that candidate." B: "Well, he's the president now, so she decided to get on the bandwagon."
See also: bandwagon, get, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

on the bandwagon, get

Also, climb or hop or jump on the bandwagon . Join a cause or movement, as in More and more people are getting on the bandwagon to denounce cigarette smoking. This expression alludes to a horse-drawn wagon carrying a brass band, used to accompany candidates on campaign tours in the second half of the 1800s. By about 1900 it was extended to supporting a campaign or other cause.
See also: get, on
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
See also: