**SNIP** Why such political carnage? Faced with the economy’s potential collapse as he took office, Mr. Obama devoted his presidency to the economic recovery, starting with restoring the financial sector. But he never made wage stagnation and growing inequality central to his economic mission, even though most Americans struggled financially for the whole of his term. At the same time, Mr. Obama declined to really spend time and capital explaining his initiatives in an effective way. He believed that positive changes on the ground, especially from economic policies and the Affordable Care Act, would succeed, vindicating his judgment and marginalizing...