Supreme Court Hears Mississippi Case on Whether Federal Election Day Law Bars Counting Mail Ballots Postmarked by Election Day but Arriving Up to Five Business Days Later
The Supreme Court heard arguments on March 23, 2026 (livestreamed at 10 a.m. EDT) in a challenge to Mississippi’s five‑day “grace period” that allows ballots postmarked by Election Day to be counted if received within five business days. The case could affect many states — 14 plus D.C. have general postmark‑based grace periods and 29 states provide extra time for some voters (including military and overseas) — with examples cited of Washington seeing about 127,000 late ballots in 2024 under a 21‑day rule and Alaska relying on 10–15‑day windows for remote communities. The dispute pits the RNC and Libertarian Party of Mississippi (arguing federal Election Day statutes require a single day) against Mississippi officials and other states defending their rules, and courts have split on whether the “election” continues while ballots are still being received, raising warnings of confusion and disenfranchisement if grace periods are invalidated.
📌 Key Facts
- Oral arguments in the Mississippi case are scheduled for Monday, March 23, 2026 at 10:00 a.m. EDT and will be livestreamed.
- The case challenges Mississippi’s five-day grace period for mail ballots postmarked by Election Day but arriving shortly after; the Republican National Committee and the Libertarian Party of Mississippi argue it conflicts with federal Election Day statutes requiring a single Election Day, while Mississippi officials urge the Court to uphold the state rule.
- Mississippi’s situation reflects an intra-party split: the Republican-controlled Legislature nearly unanimously adopted the five-day grace period in 2020 and state Republican officials (including Secretary of State Michael Watson) are defending the law even as national and state Republican organizations are suing to overturn it; Watson warned the 5th Circuit rule could jeopardize late-ballot rules in many states.
- The legal dispute turns on the meaning of “election”: the 5th Circuit held the ‘election’ is ongoing while ballots are still being received, whereas the district court viewed the ‘election’ as the voter’s final choice; early oral-argument questioning from conservative justices was described as notably hostile to the plaintiffs’ position.
- All 50 states require ballots to be marked and submitted by Election Day; the dispute concerns only receipt/counting deadlines — 14 states plus Washington, D.C. (and three U.S. territories, per reporting) have general grace periods for late-arriving, postmarked ballots, 29 states allow at least some military/overseas ballots to be counted after Election Day, and four states (Kansas, North Dakota, Ohio and Utah) recently eliminated grace periods and now require ballots to be received by Election Day.
- Practical impacts were highlighted: Alaska — where ballots must be postmarked by Election Day to be counted if received within 10 days (15 days for overseas in general elections) — depends on air transport to move ballots from remote villages and centralizes ranked‑choice tabulation in Juneau (Sen. Lisa Murkowski warned the ruling could be especially detrimental there); Washington reported about 127,000 ballots arrived after Election Day in 2024 under its 21‑day grace period and would likely be rejected if grace periods are invalidated.
- A coalition of state and large-city election officials warned that abruptly ending grace periods months before the midterms risks confusion and disenfranchisement, and observers noted that early and mail voting have effectively stretched ‘Election Day’ into weeks or even a month in many jurisdictions.
📊 Relevant Data
Voter participation in federal elections from 2012 to 2022 averaged 11 percentage points less on tribal lands than in other parts of the states where those lands are located.
Voting on Tribal Lands — Brennan Center for Justice
In the 2020 election, mail ballots from Black voters were rejected at four times the rate of those from White voters in Washington State.
Rejected Mail Ballots Are Showing Racial Disparities — The New York Times
In 2020, the voter turnout rate was 70.9% for White voters compared to 58.4% for non-White voters, representing a persistent racial gap.
Large Racial Turnout Gap Persisted in 2020 Election — Brennan Center for Justice
As of 2023, the racial and ethnic composition of active-duty U.S. military members includes 17.6% Black or African American, 18.4% Hispanic or Latino, 3.6% Asian, and 1.1% American Indian or Alaska Native, with White members comprising the majority at approximately 67%.
Department of Defense 2022 Demographic Profile — USNI News
📰 Source Timeline (5)
Follow how coverage of this story developed over time
- Live-account reporting notes that the first four sets of questions at oral argument, all from conservative justices, were described as 'notably hostile' to the Republican plaintiffs’ position challenging Mississippi’s grace-period law.
- The article underscores an explicit intra-party split: Mississippi’s Republican-controlled Legislature nearly unanimously adopted the five-day grace period in 2020, and the state’s Republican officials are now defending that law even as the Republican National Committee and Mississippi Republican Party are suing to overturn it.
- Reporters emphasize the political bind for Mississippi Republicans, who are loyal to President Trump’s push against mail voting but are arguing in court to preserve their own late-arriving ballot rules.
- The piece reiterates and contextualizes that 14 states plus Washington, D.C., and three U.S. territories accept ballots postmarked by Election Day but arriving later, and notes that this Mississippi case could affect those systems nationwide.
- The dispatch adds interpretive context that early voting and mail voting have effectively turned 'Election Day' into 'election weeks' or even 'election month' in most states, a theme surfaced in questioning at argument.
- Clarifies that all 50 states already require ballots to be marked and submitted by Election Day; the dispute is only over receipt and counting deadlines.
- Details that 14 states plus D.C. have general grace periods for late-arriving mail ballots postmarked by Election Day, and 29 states plus D.C. allow at least some military and overseas ballots to be counted if received after Election Day.
- Notes that four states — Kansas, North Dakota, Ohio and Utah — eliminated grace periods last year and now require mail ballots to be received by Election Day.
- Sets out the 5th Circuit’s reasoning that the 'election' is ongoing while ballots are still being received, versus the district court’s view that 'election' means the voter’s final choice.
- Reports that Mississippi Secretary of State Michael Watson is urging the Court to uphold his state’s 5‑day grace period as a permissible state policy choice under the Elections Clause and warning that the 5th Circuit rule could jeopardize late‑ballot rules in 29 states, including for military and overseas voters.
- Details of how Alaska’s voting system relies on air service to move ballots to and from remote Native villages such as Beaver, which is about a 40‑minute flight from the nearest city and has roughly 50 residents.
- Specific description of Alaska’s rule that ballots postmarked by Election Day are counted if received within 10 days (15 days for overseas voters in general elections), and that some rural ballots in 2022 still arrived too late even under that grace period.
- Quote from Alaska Sen. Lisa Murkowski warning that “there’s probably no other state where this ruling could have a more detrimental impact than ours,” and framing the Mississippi case as an effort to end voting by mail nationwide.
- Explanation of how Alaska’s ranked‑choice tabulation requires all ballots to be flown to Juneau, with rural precincts only phoning in first‑choice totals on election night.
- Confirms oral arguments are set for Monday, March 23, 2026, at 10 a.m. EDT and are being livestreamed.
- Details that 14 states currently provide grace periods for regular mail ballots, while 29 states provide extra time for at least some mail voters, including military and overseas ballots.
- Quotes Washington State elections director Stuart Holmes saying about 127,000 ballots arrived after Election Day in 2024 under Washington’s 21‑day grace period and would likely be rejected if grace periods are invalidated.
- Includes warning from a coalition of state and big‑city election officials about the "risks of confusion and disenfranchisement" if grace periods are abruptly ended months before the midterms.
- Reiterates that the Republican National Committee and Libertarian Party of Mississippi are challenging Mississippi’s five‑day grace period under federal Election Day statutes, framing it as a conflict with the requirement for a single Election Day.