I agree. I played around with the delegate calculator at cnn.com and I could not find any scenario where she could win. If the Beast won the remaining contests by 80% she still comes up short. If she won the remaining contests by 70%, she still needs 65% of the superdelagates to vote for her. The only reason I can see for her staying in is that she is trying to wound Obama so he loses to McCain and she can try to re-anoint herself as the front-runner in 2012.
By then she'll be 64 and look like a overused bad copy of McCain. (visually....or maybe politically also)