Just a few winters ago my wife and I took our daughters to witness the inauguration of a man who had campaigned on hope and embodied possibility. We are pretty immune to political euphoria, but, circulating among the footsore pilgrims, we could imagine our country had embraced the idea that we were all in this together. When the newly sworn-in president congratulated us all on choosing unity of purpose over recriminations and worn-out dogmas, we wanted to believe that we had done exactly that.