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.

Pennsylvania is set to be a decisive state in the 2024 election on Tuesday. Polls open at 7 a.m. ET in Pennsylvania, a “blue wall” state. This year, it’s the spot where Harris and Trump met for the first time at their sole debate in September in Philadelphia.