Progressives often find themselves explaining the details of their preferred policies, and arguing that they would maximize the common good if enacted. Conservatives, on the other hand, tend to eschew the fine print to embrace sweeping, moral narratives to back their positions. For the Right, debates over concrete public policies are often framed as contests between good and evil, freedom and tyranny; that's how, for example, conservatives can transform a modest 3 percent tax hike on the wealthiest Americans into pernicious “class warfare” and an intolerable example of “socialism.”

Call it a "rationality trap." For years, George Lakoff, a cognitive linguist at the University of California Berkeley, has argued that these tendencies put progressives at a huge disadvantage in our political discourse because the human brain simply doesn't process information in coolly analytical terms. Rather, people judge ideas against a larger moral framework, and by offering policy analysis rather than morality tales, liberals go to bat for their policies two strikes down in the count.