From the Dēmos summary:
….This analysis covers the effects of voter identification laws on voter participation during the 2016 election. Specifically, we find that changing to both “strict” and “non-strict” voter-id laws has a significant negative effect on total voter turnout and that these effects are most severe in African American areas of the country.
As a result, we can say with confidence that adding strict identification requirements had significant negative effects on voter participation during the 2016 election. ….
In Wisconsin, ID law proved insurmountable for many voters
Source: Christina A. Cassidy and Ivan Moreno, Associated Press, May 9, 2017
….By one estimate, 300,000 eligible voters in the state lacked valid photo IDs heading into the election; it is unknown how many people did not vote because they didn’t have proper identification. …