I don't see any reason for her to concede at this point in the race. Regardless of Obama's lead among delegates, she's taken the popular vote in nearly all the large state primaries and several of the smaller ones. Her fundraising has been more than adequate to support her continuing on, even if Obama has raised significantly more. I think it would be a mark against her if she gave up so easily, which I really don't think she'll do regardless of pressure from Obama's supporters.