I think Biden and McCain have a fairly good relationship. I know Biden has expressed before how much he respects McCain. . ."would be honored to run with him or against him" I think is what he said. I can't imagine going after Biden because he was trying to defend Clinton. That being said, McCain's camp will focus on Obama. . .that's how they will win.

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"No one believes more firmly than Comrade Napoleon that all animals are equal. He would be only too happy to let you make your decisions for yourselves. But sometimes you might make the wrong decisions, comrades, and then where should we be?"
- George Orwell Animal Farm