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.

Thousands of Pennsylvania voters who submitted potentially defective mail-in ballots can cast provisional ballots on election day.

Republicans had sought to block the counting of provisional ballots by voters whose mail-in ballots were deemed invalid. Democrats celebrated the ruling as a win in a crucial state.