I think Michael Graham has a point about John Edwards appearing to weaken his political credibility for the Veepstakes by staying in the race long enough to lose more Southern states. However, there’s another wrinkle to consider. It might well be better for John Kerry if there is at least a little competition going into Super Tuesday, because otherwise these primaries in several big and potential competitive states won’t get much attention. As long as Edwards continues not to try to savage Kerry personally, staying in a while longer allows the eventual nominee more opportunities to snag free media in and otherwise organize these states. I wouldn’t be shocked to discover that, at least at the staff level, there hasn’t already been some discussions about this between the two campaigns.