on the bandwagon
on the bandwagon {adj. phr.}, {informal}
In or into the newest popular group or activity; in or into something you join just because many others are joining it. — Often used after "climb", "get", or "jump".
When all George's friends decided to vote for Bill, George climbed on the bandwagon too.
See: JUMP ON THE BANDWAGON.
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Source: A Dictionary of American Idioms