Penn in Ohio

I'm sure the Obama camp knows more about this than I do, but why don't they make more of a case against Clinton regarding Mark Penn's company. As is well known on the internets, Penn's company has done quite a bit of anti-union work. He claims he has walled himself off of it, but he still profits from it.

It seems to me that this would be a pretty significant issue in Ohio where union busting and job losses have been devastating. Plus, it's the truth. Why does Clinton not distance herself from this guy? Why doesn't Obama go after them?

Questions, questions.