Using tags in the subject header to mark a thread as [Politics], [Gaming], etc in Pundit's forum might help.
If people want to add those kinds of tags, I'm not opposed. But I do think that most of the time, the titles make it pretty clear for the most part what the subject matter is going to be about.
As for threads that I start in this subforum, they're usually either linking to articles I just published at Break (MOST of which are not political these days), or archived blog entries from a year ago (again, most of which are not political).