Edwards was always running for VP, no matter what he says. If he really was serious he'd quit the race and take on Dole in his home state. Lets see how likable you really are buddy. I've been wary of him since the end of the 04 race. Here's a guy who was once very likable and cute by political standards, but lost nearly all his air when Obama sailed into the harbor. Now Edwards' campaign is only afloat due to controversy and tragedy. The former concerning Ann Coulter's comments, and the latter concerning his wife's cancer; as far as I'm concerned, both have helped his campaign. Both that won't be enough for him to overthrough the power structure that is Hillary/Obama.
Maybe he could pull some kind of miracle upset in Iowa and see a ripple effect. I doubt it, but it's certainly happened before