Billy is proudly left-wing, was wooed by the New Labour crowd but isn't uncritical of them. He collaborated with the Guthrie estate in putting music to Woody's unrecorded lyrics, turns out in support of all the usual good (or woolly pinko bleeding-heart liberal as some would say!) causes. I think he seems a genuinely good bloke.
RtS (but as usual, what do I know about owt?)