I didn't see the interview, but your view

People often want specific pot shots to be taken in campaigns ("Just call Bush a piglicking liar and we win!!") and get insolent when they're not.  I've seen Edwards weave the kinds of themes into his presentations before, sometimes as subtext.  

At this point in the campaign, why go out on a limb for anything?  

But I'm not automatically saying that it must have been a good appearance; I'm just saying that Edwards operates on a subtle level of skill sometimes.