I agree with you that it's not over, it's stupid for Obama supporters to say it is, and that we'll have a pretty good sense that someone has won when they decisively start focusing on McCain. Now is clearly not that time.
He hit McCain hard on Iraq on the anniversary. Hillary was in MI looking for the do-over. Obama has been much more focused on, and critical of, McCain, as compared to Hillary.
It's a great strategy for Hillary.
What states does HRC need to win, and by how much? What elected delegate deficit can she have going into Denver? Keep in mind that taking this from BHO (with more elected delegates) would have an affect for Democrats in November and beyond. What uncommitted super delegates can HRC count on? Keep in mind that there are many more uncommitted SDs in states won by BHO than there are in states won by HRC.
Do you think the Clintons care more about their own electoral success, or that of the party as a whole? See this link for historic data: http://www.theatlantic.com/doc/200102/sc hneider
