Let's face facts there are NO 'progressive Democrats' in the power structure right now. Just a bunch of Republicans in disguise.
See Barack 'The Great Black Hope' Obama's groveling interview in the WaPo today. With the exception of Feingold, Gore and Lamont we have only a bunch of folks more interested in themselves than what is happening to America.
Many in the blogosphere recognise this and I believe you will see calls for a wholesale replacement of the individuals and institutions in the 'Democratic Party' who have failed our nation by failing to create and support a political vision worthy of the party and the nation's history.
There are probably a few more progressives, such as my Senator Ted Kennedy.