The CBS web site has video and transcript for Obama: Romney not necessarily qualified to think about “economy as a whole”.

I feel like I could have written President Obama’s script. This is exactly the point I have been wanting him to make. Knowing how to run even a very large business is quite different from knowing how to run a country with an economy as large as the U.S. economy. Not only are the goals different as the President points out, but the feedback effects that national economic policies (as opposed to corporate policies) have on the economy itself are orders of magnitude larger than anything Romney has even thought about.