The U.S. Supreme Court heard oral arguments on March 23 in Watson v. Republican National Committee, challenging Mississippi's law allowing mail-in ballots postmarked by Election Day but received up to five days later to be counted. Justices across the ideological spectrum, including conservatives, expressed skepticism that federal law—specifically the Electors Clause—permits states to accept ballots after polls close, potentially invalidating similar grace periods in up to 29 states ahead of the 2026 midterms. No decision has issued as of late April, but trader consensus at 74% for "Yes" reflects the Court's signals during arguments and historical patterns in election law rulings, with local officials warning of processing disruptions if late ballots are barred. A ruling is anticipated by summer.