Jonathan Alter, well known to many of us from numerous appearances on Countdown, offers the following in Newsweek as Barack's "ace in the hole".
The relevant portion of Alter's article follows:
Before getting to Hillary's game, let me introduce a new ace in the hole for Obama. For all the talk of numbers, there's one that will be most important for superdelegates: 1.5 million. That reflects the 1.5 million names of donors that the Obama campaign has on file. Because no contribution below $200 is publicly reported, the vast majority of those names are in Obama's exclusive possession, to be shared as he wishes. As Graham Richard, the longtime mayor of Fort Wayne, Ind., explained it to me last week, it's all about the Benjamins. Local officials (that's who most superdelegates are) need the tens of thousands of Democratic donors on that list who come from their states. Their re-election depends on successful fund-raising. No Obama at the top of the ticket, no list. No list, and you may be back selling insurance after November.
Alter's reasoning has merit and is worthy of serious consideration.