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Right now I think it is more that she's staying in to keep the party together... I know and odd thought. But think about it in this way; Those staying with her right now are the hardcore Clinton supporters that would rather Elect McCain than Obama if they have the opportunity to say it is his fault that Hillary didn't stick it out to the very end. So her staying in until the last possible minute will give a satisfied run to those who have been supporting her from the beginning, and can move on to pick what there fellow Dems have nominated as their candidate against McCain.
Now, I won't deny that it is her fault that her supporters have come out this way, her staying in this long caused their way of thinking, but now, knowing deep in her bones, that she's not going to be the nominee this year (and possibly four years later), so what she can do is give her people what they want, and that little race will end on June 3rd. And let us hope that this is all over.