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Universal Mail Ballot Delivery Boosts Turnout: The Causal Effects of Sending Mail Ballots to All Registered Voters

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Prior to the COVID-19 pandemic, some American states had transitioned to universal voting-by-mail, where all registered voters receive a mail ballot. But due to the pandemic, universal voting-by-mail was suddenly used in a larger number of states in 2020. Here we study a unique situation in which registered voters in some legislative districts in Los Angeles County were subjected to universal voting-by-mail in the March 2020 primary. Using difference-in-differences and geographic boundary-based designs on individual-level records, we take advantage of this within-jurisdiction situation to estimate the causal effects of universal voting-by-mail on voter turnout and on who votes. Our results indicate that voter turnout increased by 3 to 4 percentage points for voters who do not automatically receive a mail ballot, and the increase is generally larger for registered partisan voters than those without a party affiliation.
Center for Open Science
Title: Universal Mail Ballot Delivery Boosts Turnout: The Causal Effects of Sending Mail Ballots to All Registered Voters
Description:
Prior to the COVID-19 pandemic, some American states had transitioned to universal voting-by-mail, where all registered voters receive a mail ballot.
But due to the pandemic, universal voting-by-mail was suddenly used in a larger number of states in 2020.
Here we study a unique situation in which registered voters in some legislative districts in Los Angeles County were subjected to universal voting-by-mail in the March 2020 primary.
Using difference-in-differences and geographic boundary-based designs on individual-level records, we take advantage of this within-jurisdiction situation to estimate the causal effects of universal voting-by-mail on voter turnout and on who votes.
Our results indicate that voter turnout increased by 3 to 4 percentage points for voters who do not automatically receive a mail ballot, and the increase is generally larger for registered partisan voters than those without a party affiliation.

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