Supreme Court Hears Mississippi Mail‑Ballot Grace‑Period Case That Could Invalidate Late‑Arriving Ballots in 14+ States
The Supreme Court will hear oral arguments on Monday, March 23, 2026 at 10 a.m. EDT (livestreamed) in a challenge brought by the Republican National Committee and the Libertarian Party of Mississippi to Mississippi’s five‑day mail‑ballot “grace period,” arguing it conflicts with federal Election Day statutes. A ruling against grace periods could upend practices in 14 states (and affect 29 states that give some voters extra time), potentially invalidating hundreds of thousands of late‑arriving ballots—Washington state, for example, saw about 127,000 such ballots in 2024—and officials warn abrupt changes could cause confusion and disenfranchisement ahead of the midterms.
📌 Key Facts
- Oral arguments in the case are scheduled for Monday, March 23, 2026, at 10 a.m. EDT and will be livestreamed.
- The challenge targets Mississippi’s five-day mail‑ballot “grace period”; the Republican National Committee and the Libertarian Party of Mississippi argue it conflicts with federal statutes that require a single Election Day.
- If the Supreme Court invalidates grace periods, late-arriving ballots that states currently accept after Election Day could be rejected, potentially affecting results and administration of the upcoming midterms.
- Fourteen states currently provide grace periods for regular mail ballots, and 29 states give extra time for at least some mail voters (including military and overseas), so the ruling could have broader national implications.
- Washington State elections director Stuart Holmes said 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 were invalidated.
- A coalition of state and big‑city election officials warned that abruptly ending grace periods months before the midterms would create "risks of confusion and disenfranchisement."
📊 Relevant Data
In Washington State from 2020-2024, Black voters had a mail ballot rejection rate of 1.3% in general elections, compared to 0.9% for White voters, with population percentages of Black residents at about 4% and White at 68%.
Patterns and Trends in Rejected Mailed Ballots in Washington State — Washington Election Data
In Washington State from 2020-2024, voters aged 18-25 had a mail ballot rejection rate of 4.1% in general elections, over 13 times higher than voters aged 66+ at 0.3%, with youth (18-24) comprising about 9% of the population.
Patterns and Trends in Rejected Mailed Ballots in Washington State — Washington Election Data
Grace periods for mail ballots in the US originated over 150 years ago during the Civil War to enable military and overseas voters to participate, with 29 states currently allowing extra time for such ballots to account for international mail delays.
150 Years of Military and Overseas Voting Now Under Threat — Voting Rights Lab
Since 2010, states like Colorado and Utah implemented mail ballot grace periods to increase voter turnout, with Colorado seeing 13-16% higher participation among African American, Asian American, and Latino voters due to expanded access.
Postal voting in the United States — Wikipedia
Rural residents in the US face higher risks from postal delays, with non-metropolitan areas experiencing slightly lower mail ballot rejection rates but greater challenges in accessing drop boxes, contributing to potential late arrivals.
Rural Residents Face the Biggest Risks from Postal Delays — Institute for Policy Studies
📰 Source Timeline (2)
Follow how coverage of this story developed over time
- 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.