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Keep living in your bubble, fact is HE NEEDS HER MORE THAT SHE NEEDS HIM AND HE CAN'T WIN WITHOUT HER SUPPORTERS.
I'm more empirically oriented about this. I don't think Hillary supporters are chattel. Each of them will be considering things over the next several weeks and figuring out what they will do. Both Hillary and Obama will be waiting. Hillary will be interested in the level of support (including much needed dollars) that she gets from her website. One cold way of looking at the situation is this: How many die-hard supporters and tens of millions does Hillary need to continue a viable fight until the convention, and what are her chances of success? It's a high risk strategy to start with that has plenty of downside.
The daily tracking polls (gallup, rasmussen) will be interesting for clues. I personally think there is a good chance that Hillary is in her strongest position now, but that's all dependent on the rate that her supporters switch to Obama.