To be honest, you can sorta make educated guesses as to his political stance based on the lyrics he writes, assuming they are honest. I could recount what I believe they are, but that'd be insulting.
How one conceptualises themselves in the modern political sphere is a diffiuclt thing to pin down, and asking someone to define themselves as a point somewhere on a predetermined scale of left/right cheapens what they may genuinely have to say.
If you want something more blunt, before he became a master of metahpor and allegory, check "Future Tense".