Having lost there, her only option would be to appeal to the convention floor - where neither of the contested delegations can vote on their own credentials, virtually assuring an Obama victory on the credentials fight and the nomination.
Clinton may well fight all the way - she's stubborn and dedicated. More, she's also farsighted and devious: She could hope to so bloody Obama that he can't beat John McCain. If McCain wins, she could get the Democratic nomination in 2012 - and, with McCain closing in on 76 and after 12 years of GOP rule, win.
But one thing is clear: Obama has this nomination sewed up.