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It's a common expression in English? People who metaphorically "journey" together.

OK, I had no idea about that. I thought you spoke of Romani people, or travelers!

I read it as stating that one can travel through opinions, ie politics are a spectrum.

"Fellow traveler" is a term for a sympathizer of a cause (generally communism) who is not a bona fide party member

“Fellow travelers” in this context is an old American term for socialists/communists who may or may not be a member of a socialist/communist party.

Interesting, OK! I've never heard "traveler" take on that meaning before.

I was assuming the poster spoke of Romani people (or "gypsies", but this is a racial slur) and it was clearly out of context.

Er... digital nomads?