A recent ruling by the 5th U.S. Circuit Court of Appeals prohibits Mississippi from counting mail-in ballots received after Election Day, even if postmarked on that day. The ruling is set to reshape ongoing legal challenges surrounding election laws, as it reverses a previous dismissal of concerns that the state's laws violate federal regulations. While this decision won't affect the upcoming Nov. 5 election, it could have significant implications in swing states. Bipartisan support exists for Mississippi's practice, adding complexity to the legal landscape as both parties prepare for the presidential election.