If I were in the Romney campaign, this ad would make me sick to my stomach. It shows that the Bain story not only continues, but is gaining momentum as a defining issue for Mitt Romney.

A politically sagacious friend of mine told me months ago that the Obama campaign had a story to tell about Bain that would unfold over months, and just when Romney was getting a handle on one charge, the next one would explode. Looks like he was right.