Gov. Romney in Iowa this week:

We have three people...running for president on the Democratic side and they want to run the largest enterprise in the world, public or private. Largest business, largest government, largest in the world. Has millions of employees a budget of $2.7 trillion, a large amount of money and not one of them has run a corner store. And the presidency is not a internship. It's a job where leadership and management is important.

That's a good--and true--line.