Here's something to smile about. Senator Obama is only 299 delegates away from officially surpassing the 2,025 threshold and securing the nomination.
As I stroke my handsome Chuck Todd Mathematical Goatee, and calculate the delegates based on worst-case very, very conservative numbers, Senator Obama can win less than half of the remaining pledged delegates and still pick up, maybe, 170 more delegates. In other words, he can basically lose the rest of the primaries and still pick up 170-180 delegates. That would mean he'd only need around 110 out of the remaining 250 (approximate) uncommitted superdelegates to surpass 2,025.
Of course, this is the worst case. Senator Obama will win North Carolina, Oregon and South Dakota. He's leading in Indiana by 5 points right now. 2,025 is right around the corner.