As usual, I'm tempted to chuckle whenever I read anything put out by the PDA. They sort of remind me of George McFly from Back to the Future: "Now, now, now Obama...". On the one hand, they have it tatooed on their foreheads that "we will dogmatically, till death do us part, always cave in and vote for Democrats". On the other, they expect the big wig Dem leaders to take their "threats" seriously. You've got to be kidding me. It's as if they're saying "Obama, you'd better not be so right-wing, or, or... we'll get really good and mad at you!".
Everyone and their brother knows that the Democratic primary is a race among a small crew of people who have raised the big money from the big donors. How the hapless, powerless PDA thinks they can actually challenge Obama, or any of the mainstream candidates, within the corporate-stymied presidential primary cycle is beyond me. It's delusional. I'm sure that many of the rank-and-file PDA members feel that they're doing the right thing, but at some point they've got to realize that they are wasting precious resources and political energy. They're doing more harm than good at this point. Whether they realize it or not, they are simply part of the effort to close the "enthusiasm gap" and corral frustrated progressives back into prison of the American duopoly.
And worse still, when the PDA doesn't get their way in the primary, everyone and their brother knows that they'll just cave in a vote for whoever the Democrats run for president. I'm sure they wouldn't think twice about spending all their time and energy getting out the vote for Erskine Bowles if he was up against Alan Simpson. They'd probably write letters to, say, The Nation exhorting us to believe that the Bowles/Simpson "face off" was the "most important election of our lives". Delusional.