(Lynne Sladky | AP file photo) In this July 30, 2020, file photo, boxes for illegal and legal vote-by-mail ballots are shown as the the Miami-Dade County canvassing board meets to verify signatures on vote-by-mail ballots for the Aug. 18 primary election at the Miami-Dade County Elections Department in Doral, Fla. Never in U.S. history will so many people exercise the right on which their democracy hinges by marking a ballot at home.