Can the Democratic Party be reformed?

Can the Democratic Party can be returned to its progressive roots? We've seen Clinton profess such an agenda but a lot of us didn't believe her. Or is the Party too far in the grip of big money to ever be ruled by the people again? Sometimes it seems like the establishment Party makes promises in a progressive direction, but it that just to appease the progressives to dupe and manipulate them? In the Sanders interview (last post) he seems to think so. I have serious doubts, given the Wall Street contingent rules the day.