But the Gini coefficient doesn’t have to be about income inequality. It’s a measure of distribution — we can change the terms to measure the inequality of something else, like the turnout for Mr. Sanders’s national organizing party at the end of last month.

Call it the Berni coefficient. It’s just like the Gini, except instead of looking at the distribution of money among people, we’re looking at the distribution of Sanders volunteers among congressional districts. A coefficient of one would mean that all Sanders’s volunteers were in one congressional district; zero would mean every district had the same amount.

By this measure, the Sanders coalition is even more unequal than the wealth in the United States. The Sanders coefficient clocks in at 0.483. It basically resembles the state of Connecticut, the second-most unequal state in the country (New York is No. 1).

Many people look at Connecticut and see one of the country’s wealthier states, epitomized by its stately towns. But the wealth of Greenwich doesn’t change the difficulties of a place like nearby Bridgeport, where 25 percent live in poverty.