I didn't either until I read his book. Definatly liberal, but didn't want anything to do with the "movement" in the late 60's and early 70's. (JF Kerry's time). And I was listening to a Peter, Paul, and Mary song (Don't think twice) and found it was written by Dylan. So there's more to him than I knew.
He was alright in the Traveling Wilburys :)