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R Republican · U.S. House 14, Illinois · Nov 3, 2026

James
T. "Jim" Marter

Republican nominee challenging incumbent Lauren Underwood in Illinois's 14th Congressional District in 2026

Researched checked 6 d ago
sources
11
positions
11
endorsements
14
Opponent Lauren Underwood D Compare race →

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

  1. Oct 6
    endorsement
    Chicago 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)
  2. Oct 3
    endorsement
    Illinois 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)
  3. Oct 3
    endorsement
    Rep. 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)
  4. Sep 21
    news
    Marter 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)
  5. Sep 21
    debate
    Marter 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)
  6. Mar 17
    filing
    Marter 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 organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Plainfield Township Republican Organization organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • ABATE of Illinois / ABATE FedPAC organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Stand for Health Freedom organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Veterans for America First organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Illinois Citizens for Life Federal PAC organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Defend LaSalle organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Aurora Township Republican Organization organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • DuPage Township Republican Organization organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Fighting for America's Future PAC organization
    Listed as endorser on campaign endorsements page; no date provided. marter4congress.us
  • Illinois Family Action organization
    Endorsed 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) official
    Listed 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) official
    Campaign 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) official
    Campaign 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.

YearSeatResultVotesShare
2022U.S. House IL-14 · RLost
2020U.S. House IL-14 · RLost
2018U.S. House IL-16 · RLost

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. [1] Editorial: Lauren Underwood for US House of ...(opens in a new tab) Oct 6, 2026
  2. [2] Congressman LaHood: IL-14 'At the very top' of IL Seats ...(opens in a new tab) Oct 5, 2026
  3. [3] Who is running for the U.S. House in the Chicago area ...(opens in a new tab) Oct 5, 2026
  4. [4] 2026 General Election Endorsements(opens in a new tab) Oct 3, 2026
  5. [5] Endorsements – Marter For Congress(opens in a new tab) Sep 22, 2026
  6. [6] GOP congressional hopeful Jim Marter on 'misuse' of AI ...(opens in a new tab) Sep 21, 2026
  7. [7] Issues – Marter For Congress(opens in a new tab) Sep 18, 2026
  8. [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. [9] replace underwood – Marter For Congress(opens in a new tab) Mar 17, 2026
  10. [10] James T. “Jim” Marter: 2026 candidate for 14th Congressional District(opens in a new tab) Feb 25, 2026
  11. [11] 2026 Election Questionnaire: Jim Marter, U.S. House ... - Shaw Local(opens in a new tab) Feb 3, 2026
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