Here's the good news about China's emergence as the world's second largest economy -- US business has figured it out. And here's the bad news -- while US companies can go global, most US citizens can't. The result, in this age of globalization, is a growing tension between the interests of America's business leaders and the interests of much of its middle class. Indeed, the most important fault-line in American politics may not be between Democrats and Republicans, it is between those businesses and business people who are succeeding in the global economy and those who are not.