A statistical analysis of the rate of double voting and the quality of data in the Crosscheck program:
"One Person, One Vote: Estimating the Prevalence of Double Voting in U.S. Presidential Elections", Sharad Goel, Marc Meredith, Michael Morse, David Rothschild, Houshmand Shirani-Mehr, October 24, 2017
Breakdown by year and state, counts of voter records sent to Crosscheck and count of in-state registered voters who have a potential "match" (this is data provided by Crosscheck each year to states).
Detailed bio on Kobach's anti-immigration and voter suppression record, "The Man Behind Trump's Voter Fraud Obsession", Ari Berman, The New York Times Magazine, June 13, 2017
The Presidential Commission and Crosscheck are both insecure and about voter suppression, Dale Ho Op-Ed, New York Times
Kris Kobach is legal counsel for the legal arm of a white nationalist hate group, Southern Poverty Law Center, June 8, 2017
Ohio's Republican Secretary of State finds voter fraud is 0.0023% of vote, Columbus Dispatch, May, 2013