Labor organizer Helen Marot once observed, "The labor unions are group efforts in the direction of democracy." What she meant is that more than simply vehicles for the economic interests of workers (which they certainly are), labor unions also foster civic participation for workers. And nowhere is this clearer than in voter turnout, which has suffered in recent years along with union membership. Indeed, new data from the Census Bureau and a new analysis of American National Election Studies data support the case that unions' declining influence has also deeply harmed democracy.

In 2014, voter turnout was abysmal, even for a midterm. Census data suggest that only 41.9 percent of the citizen population over 18 turned out to vote. However, as I note in my new Demos report Why Voting Matters, there are dispiriting gaps in turnout across class, race, and age. To examine how unions might affect policy, I performed a new analysis of both Census Bureau and American National Election Studies data. The data below, from the 2014 election, show the differences in voter turnout between union and non-union workers (the sample only includes individuals who were employed, and does not include self-employed workers). While only 39 percent of non-union workers voted in 2014, fully 52 percent of union workers did.

Sean McElwee

As part of ongoing research, James Feigenbaum, an economics PhD candidate at Harvard, ran a regression using American National Election Studies data suggesting that union members are about 4 percentage points more likely to vote and 3 points more likely to register (after controlling for demographic factors) and individuals living in a union household are 2.5 points more likely to vote and register. This is largely in line with the earlier estimates of Richard Freeman.

These numbers may appear modest, but in a close national election they could be enough to change the result.

Other research has found an even stronger turnout effect from unions. Daniel Stegmueller and Michael Becher find that after applying numerous demographic controls, union members are 10 points more likely to vote.

What's particularly important is that unions boost turnout among low- and middle-income individuals. In a 2006 study, political scientists Jan Leighley and Jonathan Nagler found that, "the decline in union membership since 1964 has affected the aggregate turnout of both low and middle-income individuals more than the aggregate turnout of high-income individuals." In 2014, the gap between unions and non-union workers shrunk at the highest rung of the income ladder. There was a 15-point gap among those earning less than $25,000 (40 percent turnout for union workers, and 25 percent turnout for non-union workers). Among those earning more than $100,000, the gap was far smaller (49 percent for non-union workers and 52 percent for union workers).

Individuals living in union households are also more progressive than those in non-union households. I examined 2012 ANES data and find that union households aren't largely different from non-union households on many issues regarding government spending, but they are more likely to have voted for Obama, identify as Democratic, and support a robust role for the government in reducing income inequality. When looking at union members specifically, the gaps become slightly larger.

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More upscale union members are far more progressive than their non-union counterparts. Non-union households with an income above $60,000 oppose government intervention to reduce inequality by 11 points, with 32.2 percent in favor and 43.4 percent against. But richer union households support government intervention, with 42.5 percent in favor and 29.9 percent opposed. As Richard B. Freeman has pointed out, "union members are more likely to vote for a Democrat for the House or Presidency than demographically comparable nonunion voters." He similarly finds that "unionism moves members to the left of where they would be given their socioeconomic status," in line with the data I examined from 2012.

Sean McElwee

A 2013 study by Jasmine Kerrissey and Evan Schofer finds that union members are not only more likely to vote, but also more likely to belong to other associations, and to protest. They also find that these effects are strongest among people with lower levels of education, suggesting that unions may help mobilize the least politically active groups. A recent study of European countries finds union members vote more and identifies those aspects of union membership that contribute to the higher turnout.

The strongest factor is that workers who engage in democratic organizations in the workplace (via collective bargaining) are more likely to engage in democracy more broadly by, for instance, voting.

Other studies support the idea that civic participation creates a feedback loop that leads to higher voting rates. Another factor is that union members make more money, and higher income is correlated with voting behavior. Finally, union members are encouraged by peers and the union to engage in politics, which also contributes to higher levels of turnout.

It's not entirely surprising that politicians who savage unions often share a similar contempt for the right to vote. Democracy in the workplace leads to democracy more broadly throughout society. Workers with more democratic workplaces are more likely to democratically engage in in society. Further, when unions and progressives demonstrate that government can benefit them, Americans are more likely to want to participate in decision-making. For all these reasons, unions play a unique and indispensable role in the progressive project. As Larry Summers, certainly not a leftist, recently argued, "the weakness of unions leaves a broad swath of the middle class largely unrepresented in the political process."