I was watching last night's results with as much nailbitingness as anyone, but what can I say that the numbers don't put more eloquently? Hillary Clinton's slight edge in Indiana doesn't look like much compared to Barack Obama's huge double-digit victory in larger North Carolina. Obama picks up a net 200,000+ votes and a handful of delegates. Hillary might stay in through next Tuesday's West Virginia primary, where she's expected to do well, but she probably realizes that there's no point now.
What's more, Clinton has been loaning her campaign millions of dollars a month, and there's at least one way she can get it back: agree to drop out of the race if the Obama campaign pays off her campaign debt. Paying off Clinton's campaign debts would be an indirect bribe since most of the debt is to Clinton herself, but at this stage who's counting? Hillary won't have any leverage for this sort of concession if she drags her campaign on much longer.
But maybe a few million dollars isn't much to risk when you're so close to the Presidency.