I agree with this 100%. Gingrich's point is drawn most poignantly in the film It's a Wonderful Life. There's absolutely nothing good about capitalism unfettered by ethics. And that's what Mitt Romney practices.
Unsurprisingly, he also practices politics unfettered by ethics.
Capitalism is an economic system that became dominant in the Western world following the demise of feudalism. There is no consensus on the precise definition nor on how the term should be used as a historical category. There is general agreement that elements of capitalism include private ownership of the means of production, creation of goods or services for profit or income, the accumulation of capital, competitive markets, voluntary exchange and wage labor.
Ethics, also known as moral philosophy, is a branch of philosophy that involves systematizing, defending, and recommending concepts of right and wrong behavior. The rules of conduct recognized in respect to a particular class of human actions or a particular group, culture, etc. medical ethics; Christian ethics. Moral principles, as of an individual: His ethics forbade betrayal of a confidence.
Captialism is an economic system not a moral/ethical code. Ethics can be applied to human behavior of any sort. I don't know how descriptive or meaningful it is to describe capitalism as ethical or unethical. You can describe people and their conduct as ethical or unethical, but I don't know how you describe an economic system that way.