Climb on the bandwagon
Climb on the bandwagon : Phrases
To join in something that looks as if it will be a success, often with a view to gaining some sort of personal benefit.
When the Vancouver Canucks are winning, I will jump on the bandwagon and be a fan.
This goes back to the southern USA custom of bands playing on a wagon in front of a religious or political rally. Supporters would jump on board in order to show their enthusiasm. Although the practice is of some age, the saying itself is first recorded about the Presidential campaign of William Jennings Bryan early in the 20th century. Climbing (or jumping) on the bandwagon was akin to providing your support for this popular candidate.
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