The Supreme Court voted 5-4 to preserve Mississippi's five-day post-Election Day mail-in ballot receipt window, handing the RNC a significant defeat ahead of the 2026 midterms.
The Supreme Court ruled 5-4 on June 29, 2026, to uphold Mississippi's law permitting mail-in ballots postmarked by Election Day to be received and counted up to five business days after polls close [1]. The majority rejected the Republican National Committee's argument that the state law conflicted with federal statutes establishing a uniform national election day [1]. Chief Justice John Roberts and Justice Amy Coney Barrett crossed ideological lines to join the three liberal justices in forming the majority [1].
The case, Watson v. Republican National Committee, reached the Court on direct challenge to the Mississippi statute. The RNC contended that allowing ballots to arrive and be tabulated in the days following Election Day violated Congress's authority to set a single, uniform date for federal elections [2]. Mississippi defended the law as a permissible regulation of ballot administration that did not alter the date on which voters cast their ballots, only the window within which election officials could receive and process them [2].
The ruling's practical reach extends well beyond Mississippi. Numerous states maintain similar post-Election Day receipt windows for absentee and mail-in ballots, and a decision striking down Mississippi's law would have cast those regimes into immediate legal uncertainty [1]. By affirming the statute, the Court drew a line between the date of voting and the administrative act of ballot receipt, a distinction that now anchors the legal framework for absentee ballot processing in federal elections [2]. The 5-4 margin, with Roberts and Barrett in the majority, signals that the Court's center holds against categorical challenges to state-level voting administration rules, at least in this posture [1].
Election officials in states with comparable receipt windows now have a clearer legal basis for their procedures heading into the November 2026 midterm elections [1]. Campaigns and state party organizations that had anticipated a ruling favorable to the RNC's position will need to adjust their litigation strategies and voter contact programs accordingly [2]. Whether the decision forecloses narrower challenges, targeting specific state laws with different statutory text or factual records, remains an open question, and further litigation testing the ruling's boundaries is probable before Election Day [2].