Bush owes the country a strong concession speech. We all know that his most extreme supporters are just this side of committable, so it is important that Bush comes out strong saying "I lost".
He owes the country this, to keep his most radical supporters from going over the edge. If he wavers, the country will fall into turmoil and it will be on his hands.
I do not expect this to happen, but this is what he owes the nation.