As Chris Bowers says, let 'em pay their own freight. Blue Dogs work against our interests and values:

Some highlight of their past behavior include being the driving force in the Democratic Party behind the 2005 bankruptcy bill (they voted 32-4 in favor), the 2006 ending of habeus corpus, the 2007 Iraq War blank check, and the 2008 FISA re-write (see here for both). So far in 2009, they only allowed the stimulus package to go through after extracting a pay-go promise from the Obama administration. Last month, they joined with the New Democrats to block foreclosure relief legislation, which Evan Bayh's Blue Dogs in the Senate seem to have killed. And most of them will vote against the budget, too.
The Blue Dogs are an overt obstacle to progressive governance. For crying out loud, their entire name comes from feeling "choked blue by the left-wing of the party." In the recent past, they have refused to send money to the DCCC because another member of Congress criticized them on Iraq. They are overtly anti-progressive and anti-left wing. They don't even work to help other members of the party. So, why are we working to help them?

I don't know, but Chris is right. We shouldn't be. They've got their own sources of funding, so let them use those, not hoover up small donations that would be better used elsewhere.