MOST RATEDSupreme Court again rejects Missouri effort to use GOP-friendly map
Onder and other plaintiffs argued that the map used in the primary should also govern the general election.
Robert F. Onder, Jr. has represented Missouri’s 3rd district in the U.S. House since 2025. On the November 3, 2026 ballot for re-election.
Onder served in the Missouri House beginning in 2007 and in the Missouri Senate from 2015 to 2023.
Onder studied at Washington University in St. Louis, Washington University School of Medicine, and Saint Louis University School of Law. Onder is an attorney and physician. Onder served in the Missouri House beginning in 2007, then in the Missouri Senate from 2015 to 2023. After winning the 2024 general election, Onder began serving in the U.S. House in 2025.Source: Wikipedia · CC BY-SA 4.0
2026 MO U.S. House district 3 general election · 2026-11-03 · No sourced statements are available for this campaign yet.
| DATE | MEASURE | VOTE | REP MAJORITY | RESULT |
|---|---|---|---|---|
| SEP 16 | S. 2403Retire through Ownership Act | YEA | YEA 191–14 | Passed 401–142/3 NEEDED |
| SEP 16 | H.R. 9497Water Resources Development Act of 2026 | YEA | YEA 202–9 | Passed 415–92/3 NEEDED |
| SEP 16 | H.R. 9340Ratepayer Protection Act | YEA | YEA 210–0 | Passed 417–32/3 NEEDED |
| SEP 16 | H.J.Res. 213Providing for congressional disapproval under chapter 8 of title 5, United States Code, o… | YEA | YEA 210–1 | Passed 214–208 |
| SEP 16 | H.R. 10326PROOF Act | YEA | YEA 210–1 | Passed 217–207 |
| SEP 16 | H.R. 9576National Fraud Enforcement Division Act of 2026 | YEA | YEA 212–0 | Passed 352–72 |
| SEP 16 | H.R. 5334Lindsey O. Graham Sanctioning Russia and Iran Act of 2026 | YEA | YEA 203–7 | Passed 262–159 |
| SEP 15 | H.Con.Res. 93Directing the President, pursuant to section 5(c) of the War Powers Resolution, to remove… | NAY | NAY 203–7 | Passed 220–204 |
| SEP 15 | H.J.Res. 210Providing for congressional disapproval under chapter 8 of title 5, United States Code, o… | YEA | YEA 212–1 | Passed 216–211 |
| SEP 15 | H.R. 9500Tax Relief for Fraud Victims ActBROKE W/ PARTY | NAY | YEA 195–17 | Passed 408–172/3 NEEDED |
| SEP 15 | H.R. 2140Diesel Emissions Reduction Act of 2025BROKE W/ PARTY | NAY | YEA 130–79 | Passed 343–792/3 NEEDED |
| SEP 15 | H.R. 4646Whistleblower Protection Act of 2025 | YEA | YEA 210–0 | Passed 424–02/3 NEEDED |
| SEP 15 | H.R. 8278Fostering the Use of Technology to Uphold Regulatory Effectiveness in Supervision Act | YEA | YEA 203–7 | Passed 417–72/3 NEEDED |
| SEP 15 | H.R. 2978GUARD Act | YEA | YEA 203–7 | Passed 414–72/3 NEEDED |
| SEP 14 | H.R. 3276Local Communities & Bird Habitat Stewardship Act of 2026BROKE W/ PARTY | NAY | YEA 138–60 | Passed 345–602/3 NEEDED |
| SEP 14 | H.R. 4219National Wildlife Refuge System Invasive Species Strike Team Act of 2025BROKE W/ PARTY | NAY | YEA 165–33 | Passed 371–332/3 NEEDED |
| SEP 03 | H.R. 4795Protect Economic and Academic Freedom Act of 2026 | YEA | YEA 203–2 | Passed 237–169 |
| SEP 02 | H.R. 1501Protecting Domestic Mining Act of 2025 | NOT VOTING | YEA 210–0 | Passed 218–201 |
| SEP 02 | H.J.Res. 1Proposing an amendment to the Constitution of the United States to require that the Supre… | YEA | YEA 211–0 | Failed 212–2062/3 NEEDED |
| SEP 01 | H.R. 9436Northeast Lobsterman Protection Act of 2026 | YEA | YEA 209–2 | Passed 219–196 |
| SEP 01 | H.R. 6500Continuing Appropriations and Extensions Act, 2027 | YEA | YEA 193–19 | Passed 370–482/3 NEEDED |
| AUG 31 | S. 32LACA | YEA | YEA 186–10 | Passed 378–102/3 NEEDED |
| AUG 31 | S. 307Prison Staff Safety Enhancement Act | YEA | YEA 187–8 | Passed 376–82/3 NEEDED |
| JUL 23 | H.R. 8884Removing Barriers to Work for Disabled Americans Act | YEA | YEA 212–0 | Passed 232–188 |
| JUL 23 | H.Con.Res. 89Directing the President, pursuant to section 5(c) of the War Powers Resolution, to remove… | NAY | NAY 207–4 | Passed 214–208 |
| BILL | TITLE · POLICY AREA | STAGE | COSPON. |
|---|---|---|---|
| H.R. 1945 | America's National Churchill Museum National Historic Landmark ActPUBLIC LANDS AND NATURAL RESOURCES | Passed both | 3 COSPON. |
| H.R. 4523 | To make technical amendments to title 49, United States Code, as necessary to improve the Code.TRANSPORTATION AND PUBLIC WORKS | Passed House | 0 COSPON. |
| H.R. 3424 | SPACE Act of 2025GOVERNMENT OPERATIONS AND POLITICS | Passed House | 2 COSPON. |
| H.R. 9228 | Health DATA Act of 2026HEALTH | Out of committee | 2 COSPON. |
| H.R. 9606 | Less Bureaucracy, Better Child Care for Student Parents ActEDUCATION | Out of committee | 1 COSPON. |
| H.R. 7651 | Chloe Cole Act of 2026LAW | Out of committee | 91 COSPON. |
| H.R. 7722 | Child Care Integrity Monitoring Act of 2026FAMILIES | Out of committee | 1 COSPON. |
| H.R. 2571 | Self-Insurance Protection ActHEALTH | Out of committee | 2 COSPON. |
| H.R. 9636 | Improving CTU Act of 2026LABOR AND EMPLOYMENT | Introduced | 0 COSPON. |
| H.R. 7554 | CARBON ActENVIRONMENTAL PROTECTION | Introduced | 0 COSPON. |
| H.R. 6222 | ROTOR ActTRANSPORTATION AND PUBLIC WORKS | Introduced | 32 COSPON. |
| H.R. 6156 | Endorsement Transparency ActLABOR AND EMPLOYMENT | Introduced | 2 COSPON. |
2026 MO U.S. House district 3 general election · 2026-11-03 · No sourced statements are available for this campaign yet.
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SINCE DEC 2021 $42K through AIPAC PAC
Earmarked gifts are part of Individuals above. AIPAC PAC filings through Aug 31.
MOST RATEDOnder and other plaintiffs argued that the map used in the primary should also govern the general election.

Onder is defending his seat against Bethany Mann after the congressional map ruling changed Cole County’s district matchup.

Onder joined a lawsuit arguing that Missouri faces federal constitutional problems if it uses different maps for its primary and general elections.

Onder is challenging Missouri’s use of different congressional maps for the primary and general election.
Onder joined a lawsuit arguing that the shift between maps could affect voters and candidates in the 2026 election.
MOST RATEDOnder is challenging the state’s use of its 2022 congressional map and is seeking to reinstate the 2025 plan.
MOST RATEDOnder and other plaintiffs argued that the map used in the primary should also govern the general election.
Record updated . ChamberLight is not an official government source. Reader ratings reflect public reception, not editorial judgment.