In an interview on CBS News, DNC Chairman Howard Dean said he wants superdelegates to make their decisions by July 1.
Said Dean: "Well, I think the superdelegates have already been
weighing in. I think that there's 800 of them and 450 of them have
already said who they're for. I'd like the other 350 to say who they're
at some point between now and the first of July so we don't have to
take this into the convention."