Tuesday is Hillary's last chance to turn this around.
I see a lot of pundits talking about Tuesday as a test for Obama. It's not. He is on top already. His delegate lead has been sustained for weeks without any slippage at all. Sure, Tuesday will be a great opportunity for Obama to put her away, and it will be disppointing for him if he does not, but that's looking at it from the wrong persepctive.
For Hillary, this is do or die time. Make no mistake about it.
For her candidacy to have any plausibility she has to outperform in both states -- win Indiana by a large margin and win NC or make it a very tight race, and come out of the day with a significant gain in both delegates and popular vote.
After Tuesday there are no big states left. The outcomes of the remaining primaries are pretty much clear already. The final pledged delegate count can be predicted with a margin of error of no more than 10. Hillary will pick up 15-20 delegates. If he even breaks even in delegates on Tuesday, Obama is certain to end the primaries up by at least 130, probably more.
West Virginia, Kentucky and Puerto Rico are not plausible 'firewalls'. After Tuesday, if HRC does not pull off a big surprise, there will be no reason for the supers to sit this out any longer. And as Joe Andrew pointed out there will be very reason to speak up.
So if there are no big surprises on Tuesday look for the trickle of supers endorsing Obama to turn into a floos. And keep in mind that there have not been any big surprises since Wisconsin, anywhere -- all that's happened is that she's won states where she was thought to have an advantage, and he's won states where he was thought to have an advantage.