My take (not that anybody asked, but I'm getting on a plane soon, and sadly, unlike Keif, I haven't been drinking): Clinton's fortunes at least until November are symbiotic with Obama's. That's true no matter what she wants to be (and there's been a startling lack of imagination on BOTF on that score -- Supreme Court Justice? Senate Majority Leader? Queen of the World? (the last, because if somebody asks, "What made you Queen of the World?" she can answer, "The popular vote." I slay myself.)) So there's no real question that she'll concede; it's more a matter of figuring out what she wants, so that it's clear to her and her supporters what's in it for them. That may take a little time; in a way she has more capital than she can spend. And she will continue to annoy those who find her annoying. It wouldn't surprise me if she's taking the measure of her clout inside the party hierarchy, and trying to do something about that. But she's savvy enough to know that a floor fight would make her the next Ralph Nader. So no, not creating unity yet, but certainly not torpedoing it either.

My preference for her would be Majority Leader -- she can shape policy, and her ambition would then have salutary constitutional consequences. Plus she's distant enough from the main event that if Obama loses, she remains the obvious option next time around.

Final thought-- I wonder if McCain is one of those folks who got more popular while nobody was paying attention to him, but when he starts showing up in the press again will lose steam. Sort of a mini Giuliani effect.