In the last presidential election, 35.5 million voters requested absentee ballots, but only 27.9 million absentee votes were counted, according to
a study by Charles Stewart III, a political scientist at the Massachusetts Institute of Technology. He calculated that 3.9 million ballots requested by voters never reached them; that another 2.9 million ballots received by voters did not make it back to election officials; and that election officials rejected 800,000 ballots. That suggests an overall failure rate of as much as 21 percent.
Some voters presumably decided not to vote after receiving ballots, but Mr. Stewart said many others most likely tried to vote and were thwarted. “If 20 percent, or even 10 percent, of voters who stood in line on Election Day were turned away,” he wrote in the study, published in The Journal of Legislation and Public Policy, “there would be national outrage.”