Last week, a flurry of litigation in Pennsylvania clarified the rules for mail balloting there. In short, mail ballots will still be rejected in the key battleground state if voters fail to properly date the affidavit that accompanies their ballot — but voters who make any mistake with their mail ballot will be able to vote by provisional ballot instead on Election Day.

The majority of mail-in ballots requested in Pennsylvania have been returned as of 8 a.m. Monday. Of the 2.2 million issued, the Department of State is in receipt of 1.8 million, or 81.4%, according to its daily report.