There's two components to a winning Democratic campaign, in my eyes, for 2008. You have to bring your passion to the table in a way that John Kerry never could and Al Gore didn't in 2000. But you also have to demonstrate the hard-nosed rapid response edge seen in Clinton '92 and '96 as well as Bush '00 and especially '04. Right now, simply by allowing the story to float out there forever the Edwards campaign is failing miserably. Every minute they sit on the pot without doing anything makes the storm bigger (and makes the comparatively well-oiled machine of the Clinton team look more "together").
It's a basic element of modern political campaigning.