What are they advocating?
Anyhow, working with someone on ONE topic, doesn't mean you are a sell-out to them because you don't agree with the rest of their agenda.
BUT, if that one issue is anathema to your supporters and core constituency, then yes, working with them on that issue would be a "sell out" of your supporters, even if you disagreed with everything else that group stood for, in-line with your supporters views.
Of course, this is academic, since ending the Fed is something the Liberty movement is in favor of, so working with We Are Change to do so, is in no way, a "sell out." (perhaps I'm misunderstanding what you are asking.)
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