Out on the campaign trail in the nascent Republican presidential primary contest, it's a very different world from the one in which Mitt Romney famously divided the nation into makers and takers. Instead, you're likely to hear contenders for the party's nomination talking about income inequality as one of the fundamental problems of the nation. Jeb Bush, Marco Rubio and Ted Cruz have all been talking about it. Even Mr. Romney got into the act when he was briefly considering a presidential run, at one point proclaiming, "Under President Obama, the rich have gotten richer, income inequality has gotten worse and there are more people in poverty in American than ever before." The GOP hopefuls generally have yet to back up the talk with policies — with the exception, to some extent, of Mr. Rubio — but the shift in tone and focus in undeniable.