Howard Dean was on NPR today (see the update at the bottom of the post). He was unequivocal that the delegates would not be seated by the DNC and that, in effect, the delegates would not be seated if Obama is ahead because Obama's delegates would control the committee that would vote on seating them. A do-over is possible - although there are no negotiations presently.

Note: I listen to NPR, I drive a prius, but I do not drink lattes.