On a conference call with liberal bloggers just now, Obama campaign officials sketched out the case they’ll be making about Romney’s Bain days, his offshoring, and his refusal to release tax returns.

“If you want to be president of the United States, what you do matters,” the official said. “Mitt Romney not only has been partaking of these policies, he still favors them.” The official added that Romney personally embodies the “speculation and risky dealmaking” that helped cause the meltdown and has badly damaged the middle class’s security.

The campaign will also use Romney’s refusal to release tax returns — which could contain more revelations about his offshoring — in order to advance their other primary argument: That Romney is in some basic way not being forthcoming about who he is.