Americans have never been too worried about the income gap. The gap between the rich and the rest has been much wider in the United States than in other developed nations for decades. Still, polls show we are much less concerned about it than people in those other nations are.

Policy makers haven’t cared much either. The United States does less than other rich countries to transfer income from the affluent to the less fortunate. Even as the income gap has grown enormously over the last 30 years, government has done little to curb the trend.

Our tolerance for a widening income gap may be ebbing, however. Since Occupy Wall Street and kindred movements highlighted the issue, the chasm between the rich and ordinary workers has become a crucial talking point in the Democratic Party’s arsenal. In a speech in Osawatomie, Kan., last December, President Obama underscored how “the rungs of the ladder of opportunity had grown farther and farther apart, and the middle class has shrunk.”

There are signs that the political strategy has traction. Inequality isn’t quite the top priority of voters: only 17 percent of Americans think it is extremely important for the government to try to reduce income and wealth inequality, according to a Gallup survey last November. That is about half the share that said reigniting economic growth was crucial.