New research on vote-by-mail: "Does Voting By Mail Increase Participation? Using Matching to Analyze a Natural Experiment"

There’s a paper that’s been accepted for publication in the journal, Political Analysis, that uses “matching” methods (methods that are now being used in many social sciences) to look at the question of whether vote-by-mail elections increase voter turnout. This paper, by Thad Kousser and Megan Mullin, “Does Voting By Mail Increase Participation? Using Matching to Analyze a Natural Experiment” is now available in “advance access” from the Political Analysis website.

Here’s the paper’s abstract:

Would holding elections by mail increase voter turnout? Many electoral reform advocates predict that mail ballot elections will boost participation, basing their prediction on the high turnout rate among absentee voters and on the rise in voter turnout after Oregon switched to voting by mail. However, selection problems inherent to studies of absentee voters and Oregon give us important reasons to doubt whether their results would extend to more general applications of voting by mail. In this paper, we isolate the effects of voting in mail ballot elections by taking advantage of a natural experiment in which voters are assigned in a nearly random process to cast their ballots by mail. We use matching methods to ensure that, in our analysis, the demographic characteristics of these voters mirror those of polling-place voters who take part in the same elections. Drawing on data from a large sample of California counties in two general elections, we find that voting by mail does not deliver on the promise of greater participation in general elections. In fact, voters who are assigned to vote by mail turn out at lower rates than those who are sent to a polling place. Analysis of a sample of local special elections, by contrast, indicates that voting by mail can increase turnout in these otherwise low-participation contests.

I’ve only briefly read the paper, it’s an interesting application of the “matching” method to the important question of whether VBM increases turnout. I suspect Paul might have some additional reactions and comments about the paper, and when I get a chance to read it more carefully myself, I’ll probably have some additional things to say.