Well, they don't declare it as definitely as that. But in this article, they do outline that each day, the odds that Clinton can pull off the superdelegate support she needs dwindles.

Trailing by more than 160 pledged delegates — those chosen in state primaries or caucuses — Mrs. Clinton has counted on superdelegates to help her overtake Mr. Obama with a late surge before the party’s convention in August. The party’s rules for proportional allocation make it highly difficult for her to erase Mr. Obama’s pledged delegate lead, even if she sweeps the final 10 contests.

So her aides have lobbied to persuade those still uncommitted superdelegates to back her — or to continue holding out so her campaign has the chance to demonstrate momentum and superior electability in primaries from Pennsylvania’s on April 22 through Montana’s on June 3.

Yet Mrs. Clinton’s once formidable lead among superdelegates who have announced preferences has shrunk to 34 by the Obama campaign count. The pool of remaining uncommitted superdelegates for her to draw from has dwindled to around 330, fewer than half the overall total of 795 superdelegates.

Even if Mrs. Clinton narrows Mr. Obama’s delegate lead to 100, and if no further superdelegates make commitments through the end of the primaries, she’d wake up June 4 needing to win over two-thirds of the still-uncommitted superdelegates.

Another good read — Markos Moulitsas (aka Kos of DailyKos) thinks the ongoing Democratic battle is a good thing. Who knew?

Hat tip to Lawrence and shaug respectively for sharing these articles.