Mitt Romney's résumé at Bain should be a slam dunk. He has been a successful capitalist, and capitalism is the best thing that has ever happened to the material condition of the human race. From the dawn of history until the 18th century, every society in the world was impoverished, with only the thinnest film of wealth on top. Then came capitalism and the Industrial Revolution. Everywhere that capitalism subsequently took hold, national wealth began to increase and poverty began to fall. Everywhere that capitalism didn't take hold, people remained impoverished. Everywhere that capitalism has been...