Provisional ballots can take multiple days to be counted after an election due to the number of ballots cast and the time it takes to verify a voter’s eligibility.

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.