Having joined or following along with what is successful, popular, or common among the majority of people. I don't think most people actually care about his politics, they just like getting on the bandwagon of outrage.

What does it mean jumped on the bandwagon?

If someone, especially a politician, jumps or climbs on the bandwagon, they become involved in an activity or movement because it is fashionable or likely to succeed and not because they are really interested in it.

What does the phrase bandwagon mean?

1 : a usually ornate and high wagon for a band of musicians especially in a circus parade. 2 : a popular party, faction, or cause that attracts growing support —often used in such phrases as jump on the bandwagon. 3 : a current or fashionable trend.