After the polls close, the election outcome is generally determined, and it’s just a matter of letting the count proceed and waiting for the results. But one exception is provisional ballots, where campaigns continue their GOTV efforts to encourage those who voted that way to cure their ballots before the deadline.
Mississippi’s senate seat is likely to be decided by provisional ballots this year, so we’re seeing a lot of this activity now.
“GOTV” = “Get Out The Vote”