Right to challenge ballot rules
Bost v. Illinois State Board of Elections
In brief
Bost won the right to continue his challenge, but the Court did not itself decide whether Illinois' ballot-counting rule is lawful.
- Where it stands
- Decided
Decided 7-2 · January 14, 2026 · Opinion by Chief Justice Roberts
- What it’s about
- The Supreme Court held 7-2 that a candidate for office has standing to challenge election rules governing the counting of votes.
- Who it affects
- Federal candidates can now bring court challenges to state rules for counting votes in their own elections. For example, a candidate may challenge a rule governing when mail ballots are counted.
Summary: written with AI from the case record.
What it's about
Chief Justice Roberts wrote for the majority, reversing the lower courts' dismissal of a lawsuit challenging Illinois' practice of counting mail-in ballots received up to two weeks after Election Day.
The case concerns when candidates may use federal courts to challenge state time, place, and manner rules for federal elections.
Question presented
Do federal candidates have Article III standing to challenge state laws that allow mail-in ballots to be received and counted for two weeks after Election Day based on claims that such laws dilute their votes and force them to incur additional campaign expenses for extended ballot monitoring?
What the Court decided
Holding
As a candidate for office, Congressman Bost has standing to challenge the rules that govern the counting of votes in his election. Pp. 3– 10. 114 F. 4th 634, reversed and remanded.
- Result
- Reversed
The vote
- Joined the judgment
- Concurred in a separate opinion
- Dissented
- Wrote an opinion
From the opinions
“A majority of the Court nevertheless concludes that Bost has standing to sue based solely on his status as a candidate for office.”
What's next
The case returns to the lower courts, which must consider Bost's challenge on its merits. Illinois election officials and the parties will continue litigating whether the challenged counting rules are valid.
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More questions
- What did the Supreme Court rule in Bost v. Illinois State Board of Elections?
- The Court ruled that Bost has standing (a legal right to bring a case) to challenge vote-counting rules in his election. It reversed the dismissal.
- Who won Bost v. Illinois State Board of Elections?
- Bost won at the Supreme Court because the Court revived his lawsuit. The Court did not decide whether Illinois' rule is lawful.
- What does Bost mean for federal candidates?
- Federal candidates may challenge state rules governing the counting of votes in their elections. They still must litigate the substance of each challenge.
- Is Illinois' mail-ballot counting rule still the law after Bost?
- The Supreme Court did not invalidate Illinois' rule. The lower courts will now consider Bost's challenge on its merits.
- What happens next in Bost v. Illinois State Board of Elections?
- The case goes back to the lower courts for further proceedings. They will address the challenge to Illinois' vote-counting rules.
Sources
Primary materials plus reporting. Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.