It was just getting to the point where Clinton's corporate backing was showing through the facade, and one was thinking wearily, cynically, "Ah well, first woman President, and she has all that experience, and Bill's always good for a laugh..." Then POW! Obama really does look like he can do it. The Iowa victory speech was very good.
Best of all was his subsequent brushing aside of the Republicans. Notice Hillary's frozen smile. Not even Bill could have come up with that one.