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Why is it more awful to have Hillary coming to the rescue than it is to have Joe Biden coming to the rescue?
Because Biden doesn't have a small army of 'very enthusiastic' supporters wrecking havoc within the party, making demands. You don't hear Biden supporters threatening (or promising) to take over and purge the party or start a new one (not that that isn't a bad idea, but we can question the timing). You don't hear them saying they wuz robbed like quite a few posters said last night here.
Some people will conclude that selecting Hillary amounts to capitulation. I don't see how that favors Obama.