I think much of this talk is based on the premise that Obama is leading by some totally lopsided score. When truth be told, this is one of the closest Presidential primaries in American history.
But with just 2 weeks and five remaining contests to go, its like any close basketball or football game. The score is very close, the second place team could get some lucky breaks, but there is that little matter of a clock, and when time runs out, time runs out and its over.
Hillary is at near that clock runs out point now, she may choose to conceded if Obama wins Oregon, or she may soldier on and try to take Puerto Rico. If she can do that, she is still likely to end on a low note by losing SD and MT on June 3. And on June 3 the clock does run out. And given that Obama is now 120 delegates short, and should take about 90 of the remaining elected delegates, it leaves Obama 30 short come June 3. Hillary then will have to win all but 29 of the remaining super delegates or better than 85%. Which ain't gonna happen folks unless Obama self destructs.
But give Hillary her due, she ran a very close race, I for one think only she should pick the moment to concede. BUT CONCEDE SHE MUST. But I agree with Eskimospy, good chance it will be May 20 because she can concede on a high note with Kentucky and not Oregon in her win column.
Then, I think many GOP types who are hoping for a deeply divided democratic party are going to be very deeply disappointed.