James
T. "Jim" Marter
Republican nominee challenging incumbent Lauren Underwood in Illinois's 14th Congressional District in 2026
- sources
- 11
- positions
- 11
- endorsements
- 14
Background
James T. "Jim" Marter is the Republican nominee for Illinois's 14th Congressional District in the November 2026 general election, challenging incumbent Democrat Lauren Underwood. He is based in Oswego, Illinois, and was raised in Bartonville. 58
Marter founded a software consulting company in September 2002 and has worked in information technology, project management, and business-process implementation. Before that, he worked at Dow Chemical from 1985 to 1997 and at SAP America from 1997 to 2002. He holds a 1984 bachelor's degree in industrial management with a minor in computer science from Purdue University. 8
He began his political engagement in 2015, serving as a Republican precinct committee person for Oswego 22 (elected four times since 2015) and as Kendall County Republican chairman for three full terms between 2016 and 2024. He also served as an Oswego Library District Board trustee from 2021 to 2025, as deputy on the Illinois GOP State Central Committee for the 14th District in 2022, and as an Illinois 14th District presidential elector in 2020. 8
Marter previously sought the Republican nomination for the 14th District in prior election cycles. In the 2026 race, he has emphasized issues including government spending, immigration enforcement, election integrity, and AI policy. 567
At a glance
- Party
- Republican
- Running for
- U.S. House · District 14, Illinois
- Election
- Nov 3, 2026
- Current office
- Owner, software consulting company
- Website
- marter4congress.us(opens in a new tab)
Where they stand
Each position links to the page it was drawn from. Quotes are verbatim.
Timeline
- Oct 6endorsementChicago Tribune editorial board endorses Underwood over Marter
The Tribune endorsed incumbent Lauren Underwood rather than Marter. The editorial noted Marter told the paper he supports zero-based budgeting and opposes gerrymandering, and quoted him as having 'zero concern for bipartisanship.'
Editorial: Lauren Underwood for US House of ... · Oct 6, 2026 (opens in a new tab) - Oct 3endorsementIllinois Family Action endorses Marter for IL-14
The conservative advocacy organization Illinois Family Action listed Jim Marter among its endorsed candidates for the 2026 general election.
2026 General Election Endorsements · Oct 3, 2026 (opens in a new tab) - Oct 3endorsementRep. Darin LaHood speaks at Yorkville fundraiser for Marter
Republican Congressman Darin LaHood appeared at a Yorkville fundraiser for Marter, saying 'My goal is for Jim Marter to be my colleague after November 3rd in Congress' and pledging to work with House Speaker Mike Johnson and GOP leadership to support Marter. The account was issued by the Marter campaign.
Congressman LaHood: IL-14 'At the very top' of IL Seats ... · Oct 5, 2026 (opens in a new tab) - Sep 21newsMarter discusses AI, immigration, and election integrity on Illinois Public Media
In an interview on The 21st Show, Marter said AI regulation should address privacy and IP misuse, praised the Trump administration on immigration enforcement, and called for a federally supported open audit process for elections. He opposed Illinois' 40-day early voting period, favoring about one week instead.
GOP congressional hopeful Jim Marter on 'misuse' of AI ... · Sep 21, 2026 (opens in a new tab) - Sep 21debateMarter accuses Underwood of dodging debates
During his Illinois Public Media interview, Marter said he had challenged Underwood to debate and accused her of dodging debates. The program reported no scheduled or completed debate and noted it had also invited Underwood for an interview.
GOP congressional hopeful Jim Marter on 'misuse' of AI ... · Sep 21, 2026 (opens in a new tab) - Mar 17filingMarter wins Republican primary with 74.9% of the vote
Jim Marter defeated three other candidates in the Republican primary, capturing 74.9% of the vote to become the GOP nominee for IL-14. Lauren Underwood ran unopposed in the Democratic primary.
Who is running for the U.S. House in the Chicago area ... · Oct 5, 2026 (opens in a new tab)
Endorsements
- Illinois House Freedom Caucus organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Plainfield Township Republican Organization organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- ABATE of Illinois / ABATE FedPAC organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Stand for Health Freedom organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Veterans for America First organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Illinois Citizens for Life Federal PAC organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Defend LaSalle organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Aurora Township Republican Organization organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- DuPage Township Republican Organization organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Fighting for America's Future PAC organizationListed as endorser on campaign endorsements page; no date provided. marter4congress.us
- Illinois Family Action organizationEndorsed Marter for the 2026 general election; endorsement list published October 3, 2026. illinoisfamilyaction.org · Oct 3, 2026
- U.S. Rep. Darin LaHood (R–IL-16) officialListed on campaign endorsements page. At a Marter fundraiser on October 3, 2026, LaHood publicly supported him and said, "My goal is for Jim Marter to be my colleague after November 3rd in Congress." einpresswire.com · Oct 3, 2026
- U.S. Rep. Mary Miller (R–IL-15) officialCampaign announced her endorsement on March 10, 2026. Marter said, "I'm excited and grateful to have Congresswoman Mary Miller's endorsement." marter4congress.us · Mar 10, 2026
- U.S. Rep. Mike Bost (R–IL-12) officialCampaign announced his endorsement on August 19, 2024. marter4congress.us · Aug 19, 2024
Past elections
General election results for federal office, from the Federal Election Commission.
| Year | Seat | Result | Votes | Share |
|---|---|---|---|---|
| 2022 | U.S. House IL-14 · R | Lost | ||
| 2020 | U.S. House IL-14 · R | Lost | ||
| 2018 | U.S. House IL-16 · R | Lost |
Covers the 2016 to 2022 general elections. The FEC has not yet published 2024 congressional results.
Campaign finance
Totals filed with the Federal Election Commission for the 2026 election cycle.
- Raised
- $141K
- Spent
- $113K
- Cash on hand
- $32K
As of Jun 30, 2026. Filings are periodic, so recent money may not be included yet. ↳ FEC record H8IL16153(opens in a new tab)
Sources 11
- [1] Editorial: Lauren Underwood for US House of ...(opens in a new tab) Oct 6, 2026
- [2] Congressman LaHood: IL-14 'At the very top' of IL Seats ...(opens in a new tab) Oct 5, 2026
- [3] Who is running for the U.S. House in the Chicago area ...(opens in a new tab) Oct 5, 2026
- [4] 2026 General Election Endorsements(opens in a new tab) Oct 3, 2026
- [5] Endorsements – Marter For Congress(opens in a new tab) Sep 22, 2026
- [6] GOP congressional hopeful Jim Marter on 'misuse' of AI ...(opens in a new tab) Sep 21, 2026
- [7] Issues – Marter For Congress(opens in a new tab) Sep 18, 2026
- [8] Jim Marter for Congress (IL-14) Releases Statement on Support for Israel, Condemning Failed Foreign Policy of Opponent(opens in a new tab) Sep 18, 2026
- [9] replace underwood – Marter For Congress(opens in a new tab) Mar 17, 2026
- [10] James T. “Jim” Marter: 2026 candidate for 14th Congressional District(opens in a new tab) Feb 25, 2026
- [11] 2026 Election Questionnaire: Jim Marter, U.S. House ... - Shaw Local(opens in a new tab) Feb 3, 2026