He has an op-ed piece in tomorrow's New York Times:
A nation's artists and musicians have a particular place in its social and political life. Over the years I've tried to think long and hard about what it means to be American: about the distinctive identity and position we have in the world, and how that position is best carried. I've tried to write songs that speak to our pride and criticize our failures.
These questions are at the heart of this election: who we are, what we stand for, why we fight. Personally, for the last 25 years I have always stayed one step away from partisan politics. Instead, I have been partisan about a set of ideals: economic justice, civil rights, a humane foreign policy, freedom and a decent life for all of our citizens. This year, however, for many of us the stakes have risen too high to sit this election out....
It is through the truthful exercising of the best of human qualities - respect for others, honesty about ourselves, faith in our ideals - that we come to life in God's eyes. It is how our soul, as a nation and as individuals, is revealed. Our American government has strayed too far from American values. It is time to move forward. The country we carry in our hearts is waiting.