It's a clear enough win that she can "claim" she's got the momentum, but that's a joke—Obama shaved 20 points off Clinton's 26-point advantage from six weeks ago. In her speech, Clinton claimed the "tide is turning." No, Hillary, it is still washing your ass out to sea, you've just managed to hang on to the pier a little longer...you're almost out of pilings, and you have no way to get back to shore.
It would have been nice for Obama to notch an upset here and break the back of Clinton's campaign, but alas we are where we were yesterday for at least a few more weeks. She made no significant gains in popular vote OR delegates (she looks to have picked up 10-12 delegates while she trails by 150+), so she just continues to stall the inevitable.
She needed a blowout, and she didn't get it. Another 158 delegates are off the table, and the lead remains insurmountable—in a sense, it's a "hold" for Obama.
UPDATE: John Cole puts it a bit more colorfully...
Hillary’s campaign now seems to boil down to her playing the role of Lucy, with little more than catcalls that Obama “can not close the deal.” “Sure,” she seems to say, “he has kicked my ass in every measurable metric this campaign, but why, oh why can he just not finish me off? Clearly that means you should make me the nominee.”
Regardless, Hillary’s vanity campaign will continue on, trailing in delegates, trailing in the popular vote, trailing in enthusiasm and money, but not lacking in the firm resolve that only Hillary can save us all from our selves. I can not tell you how much I am looking forward to more Clintonian triangulation and McCain worship and plans to nuke Iran over the next two weeks as we wait for the super-delegates and the voters of North Carolina and Indiana to break out the wreath of garlic and wooden stakes so we can finally be rid of this menace.