One, and only one, candidate, Barack Obama, caught the X-factor and improbably got himself nominated and elected, and re-elected, president. Another improbable candidate could catch it again.What is that X-factor? How does it upend things?Peace and personal security continued to flourish in 2014 and are likely to continue into 2015 and beyond. This is important news. It also is news the news media can ill afford to report. But voters sense it.Two of our greatest public intellectuals, Steven Pinker and Andrew Mack, provide a defining “state of the world” summation in Slate.com inThe World Is Not Falling Apart. The evidence...