The U.S. Supreme Court signaled a likely rejection of Mississippi's late-arriving mail-in ballot law, a decision with national implications for the 2024 elections. 725,000 ballots counted post-Election Day in 2024 could be invalidated if the conservative majority strikes down the state's provision allowing ballots postmarked by Election Day to be counted if received soon after. Currently, 18 states and territories permit such late counting, a practice that could vanish if the Court invalidates Mississippi's law. This shift risks disenfranchising hundreds of thousands of voters in the coming midterms, potentially causing significant voter confusion as rules change mid-cycle.

The outcome hinges on the Court's final ruling, which could reshape ballot access nationwide.