Read all of this at The American Prospect

The Democrats' "liberal" problem isn't about issues, it's about identity.

As part of a solution, many on the left have decided to start with a clean slate, ditching "liberal" in favor of "progressive." As a strategic move, this has much to commend it. Recent American political history has made it hard to argue that the root of "liberal" -- liberty -- belongs more to the left than to the right. In contrast, liberals can legitimately claim that they and not conservatives are the advocates of progress. They can argue that with their desire to conserve, conservatives are stuck in the past, while progressives want to achieve social and economic progress. Any number of different issues can be understood through this prism.

But the rebranding of the left through the substitution of "progressive" for "liberal" can only succeed if all on the left agree that they are in fact progressives, and proclaim it loudly. If they accompany that proclamation with a critique not just of conservative policies and politicians but of conservatism itself, they'll find more and more moderates calling themselves progressive. Otherwise, they'll be right back where they started.