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Onder v. State of Missouri
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Onder v. State of Missouri

Federal suit contesting which congressional map applies to Missouri's 2026 election.

As of 23 September, Onder v. State of Missouri remains before the US Supreme Court over which congressional map Missouri may use for its federal election.

Last refreshed: 24 September 2026 · Appears in 1 active topic

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Background

Onder v. State of Missouri is a federal case over the congressional districts Missouri must use. Robert Onder and three Republican co-plaintiffs challenge the state’s departure from HB 1, a Republican-drawn congressional map.

The dispute tests how federal constitutional requirements for district population equality constrain a state court’s election-map ruling. The Eighth Circuit ruled for the plaintiffs on 21 September and directed the district court to bar use of any map other than HB 1.

The case matters because its outcome determines the legal map for Missouri’s congressional election. It also sits beside a referendum on HB 1, leaving voters and election officials exposed to competing legal routes for the same districts.

Common Questions

Reference

What is Onder v. State of Missouri about?
Robert Onder and three Republican co-plaintiffs sued in the Eastern District of Missouri to force use of the state's HB 1 congressional map. A judge granted a temporary restraining order on 8 September 2026, which the US Supreme Court stayed two days later.Source: event
Who are the parties in the Missouri congressional map lawsuit?
US Representative Robert Onder and three other Republican plaintiffs sued to require Missouri to use its HB 1 map. People Not Politicians, the referendum group that got the map suspended pending a public vote, defends the opposing side and has taken the fight to the US Supreme Court.Source: PACER docket 4:26-cv-01424, E.D. Mo.; Supreme Court docket 26A388
Who are the plaintiffs in Onder v. State of Missouri?
US Representative Robert Onder and three other Republican plaintiffs, WHO sued to require Missouri to use its Republican-drawn HB 1 congressional map rather than the map the state Supreme Court reinstated.Source: PACER docket 4:26-cv-01424, E.D. Mo. (via CourtListener)
Which congressional map is Missouri using for the 2026 election?
As of 21 September 2026 the Eighth Circuit has ordered Missouri to use HB 1, the Republican-drawn 2025 map, reversing an earlier Missouri Supreme Court ruling that blocked it. People Not Politicians has since asked the US Supreme Court to stay that order, so the question remains open pending further review.Source: event
What is Missouri Proposition A?
Proposition A is the 3 November 2026 referendum asking Missouri voters whether HB 1, the Republican-drawn congressional map, should take effect at all. It shares the ballot with the congressional election the map itself would govern.
What court is hearing the appeal in Onder v. State of Missouri?
The case is on appeal to the US Court of Appeals for the Eighth Circuit, docketed as 26-2797, after the Supreme Court stayed the district court's order pending that appeal.Source: Supreme Court of the United States, docket 26A326
Source Material
Docket for 26A326Onder v. State of Missouri, No. 4:26-cv-01424 (E.D. Mo.)