Do a Google News search for “income inequality” and it will remove any doubt that this is already the political issue of 2014. The left has been gearing up for months. The liberal Center for American Progress launched a new center devoted to the subject, and President Obama has been making it a centerpiece of his speeches. Get ready to hear about “fairness”—because some people make more money than others, and this isn’t fair. How can you sit by and watch this happen? What is the government going to do about it? It’s a popular argument because everyone—even Warren Buffett—wants...