Clinton has a good reason to stay. She is a lot more electable than Obama.
The key to becoming a president is winning Deep South. The reason we had Bush for two terms is that Southern whites voted for him in massive numbers two times in a row. Racism is still strong there. In 2004, Louisiana whites voted 75% Bush / 24% Kerry, blacks voted 9% Bush / 90% Kerry. Georgia whites voted 76%/23%, blacks voted 12%/88%. Bush won both states. And that was with white democratic nominee.
There aren’t enough blacks in the South to turn those states Democratic if we pick Obama, and those blacks vote Democratic anyway. But there are plenty of racist whites who would choose McCain just to keep a black man out of the White House.
As much as I like Obama, his face-off with McCain could be a disaster.
I still hope for some kind of compromise, such as Clinton as VP. But it seems that there’s too much bad blood between them.