I don't know how you can reasonably separate the "traditional" from the "political" -- they are too interwoven -- but even if you can I don't see why you should.

Then again, let us remember (as always) the wisdom of Tom Lehrer: "The reason most folk songs are so atrocious is that they were written by the people." :)

But now that I've offended all egalitarian sensibilities, here's the Left's chance to strike back: Why are there so few Conservative "political" and/or "folk", songs? Is it that rightwingers can't carry a tune? Or, something deeper & darker? I don't think it's that the conservatives have nothing to protest. They're always griping about something or other. Listen to Talk Radio. / On the other hand, is the premise simply untrue -- a definitional mirage? What about country music's rightist-populist-patriot subgenre -- does that count?