SCOTUS in Watson v. RNC Upholds Mississippi 5-Day Mail-Ballot Window, 5-4, Barrett Writes for Liberal Bloc

On June 29, 2026, the Supreme Court ruled 5-4 in Watson v. Republican National Committee that Mississippi’s 2020 law permitting mail-in ballots postmarked by Election Day and received within five days may stand. Justice Amy Coney Barrett authored the majority opinion, joining Chief Justice Roberts and Justices Sotomayor, Kagan, and Jackson; the majority reasoned that the federal Election Day statutes fix when voting must occur but do not set a ballot-receipt deadline. The decision blocks the RNC’s effort to invalidate late-arriving mail ballots and is a rare Trump-side loss at the Court on election administration.

This is a counter-current in the election-administration lane otherwise trending toward restriction — the Callais gutting of VRA Section 2 (2026-04-29–scotus-callais-guts-section-2-vra-reworks-gingles-standard) and the Alabama-map shadow-docket order (2026-06-02–scotus-shadow-docket-reinstates-alabama-gop-map-over-intentional-discrimination-finding). It lands amid the administration’s mail-voting pressure campaign — the 2026-06-15–trump-dhs-1b-grant-threat-force-state-voting-overhaul-midterms grant threat and the Talwani EO challenge (2026-06-17–talwani-allows-mail-ballot-eo-challenge-rejects-ripeness-delay) — and may give states legal cover to resist phase-outs of mail voting. Barrett writing for the liberal bloc marks a notable limit on her deference to election-administration overreach.