I was under the impression that if you signed up for the P. Buchanan newsletter, you were considered a "Brigade Member". If I recall, that site is run by one of Buchanan's supporters, not even him. All you get is news from some other writer that no one heard of.
I don't think he keeps up with that site much anymore since he has run for office? I just don't see how this is going to wildly hurt Palin unless I'm missing something about what it means to be a Brigade Member. As far as I know, it's just an email list that started when he tried to run for President.