As catchy pop-social science coinages go, “the Big Sort” may not have quite the pith or resonance of, say, “bobos” or “tipping points.” But in attempting to define and argue the implications of the sweeping social and political balkanization that has swept across America over the last 30 years, Bill Bishop has set his sights ambitiously on David Brooks and Malcolm Gladwell territory: identifying a big, worldview-changing social science phenomenon, and interpreting it for a popular audience.