I think the author is wrong...but I hope obama heeds her advice. I think adding Hillary would help obama a LOT. On the other hand, I think Biden really really helps the GOP.
I hope he stays.
It's also true they won't jump in if they think Bambi is going to lose. She couldn't handle being the losing VP candidate and the potential scapegoat. If they think he has a good chance of winning, I think they might jump on the bandwagon if they can get her close to the presidency (hint, hint: impeachment, arkancide, etc).