Obama has gained 69 superdelegates and Clinton has lost 2 over the past 60 days. And in that time, we've had the Rev. Wright controversy and Clinton's victory in Ohio. The idea that some other bit of news will come around that would alter a two-month-long unbroken string of momentum is frankly at odds with reality. If those undecideds haven't swung by now, they're simply not going to swing.
...this is regardless of who you feel should be the nominee, or whether Sen. Clinton should stay in the race. It's just a depiction of reality.