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R Republican · Incumbent · U.S. House 8, Indiana · Nov 3, 2026

Mark
Messmer

Republican incumbent Mark Messmer represents Indiana's 8th Congressional District, first elected in 2024.

Researched checked 6 d ago
sources
17
positions
9
endorsements
12
markmessmer.com ↗(opens in a new tab) X(opens in a new tab)
Opponent Mary Allen D Compare race →

Background

Mark Messmer is the Republican U.S. Representative for Indiana's 8th Congressional District, having been sworn in on January 3, 2025. He is seeking a second term in the November 3, 2026, general election, making him the incumbent in that race. [Sources: 3, 17, 23]

Before his federal service, Messmer held several Indiana state offices: he served as an Indiana State Representative for District 63 from 2008 to 2014, then as an Indiana State Senator for District 48 from 2014 to 2024. [Sources: 3, 23]

Messmer earned a B.S. in Mechanical Engineering from Purdue University in 1985. His career before politics included engineering positions at John Brown Engineers & Constructors and Dow Chemical, and he later became co-owner of a mechanical contracting business. He identifies as a small-business owner from Jasper, Indiana. [Sources: 3, 10, 16, 18]

Messmer was selected to serve on key congressional committees following his election to the House. His official congressional website and campaign website are active, and he maintains a presence on X as @RepMessmer. [Sources: 8, 12, 21]

At a glance

Party
Republican · Incumbent
Running for
U.S. House · District 8, Indiana
Election
Nov 3, 2026
Current office
U.S. Representative for Indiana's 8th Congressional District
Website
markmessmer.com(opens in a new tab)

Where they stand

Each position links to the page it was drawn from. Quotes are verbatim.

Voting record

How Mark Messmer voted in Congress: 119th Congress (2025–26), Jan 3, 2025 to Sep 16, 2026. From the official House and Senate roll call records.

roll call votes
674
missed
1.9%
with their party’s majority
99%

Recent key votes

  • Sep 16, 2026 · House · S2403 · Economy & jobs
    Retire through Ownership Act
    On Motion to Suspend the Rules and Pass · Passed
    Official roll call ↗(opens in a new tab)
    Yes
  • Sep 16, 2026 · House · HR9497 · Climate & energy
    Water Resources Development Act
    On Motion to Suspend the Rules and Pass, as Amended · Passed
    Official roll call ↗(opens in a new tab)
    Yes
  • Sep 16, 2026 · House · HR9340 · Climate & energy
    Ratepayer Protection Act
    On Motion to Suspend the Rules and Pass, as Amended · Passed
    Official roll call ↗(opens in a new tab)
    Yes
  • Sep 16, 2026 · House · HJRES213 · Climate & energy
    Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule issued by the Environmental Protection Agency relating to the “California State Nonroad Engine Pollution Control Standards; Commercial Harbor Craft Regulations; Notice of Decision”
    On Passage · Passed
    Official roll call ↗(opens in a new tab)
    Yes
  • Sep 16, 2026 · House · HR10326 · Crime & public safety
    PROOF Act
    On Passage · Passed
    Official roll call ↗(opens in a new tab)
    Yes
  • Sep 16, 2026 · House · HR9576 · Crime & public safety
    National Fraud Enforcement Division Act
    On Passage · Passed
    Official roll call ↗(opens in a new tab)
    Yes
  • Sep 15, 2026 · House · HJRES210 · Climate & energy
    Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to “California State Nonroad Engine Pollution Control Standards; Ocean-Going Vessels At-Berth; Notice of Decision”
    On Passage · Passed
    Official roll call ↗(opens in a new tab)
    Yes
  • Sep 15, 2026 · House · HR9500 · Taxes & budget
    Tax Relief for Fraud Victims Act
    On Motion to Suspend the Rules and Pass, as Amended · Passed
    Official roll call ↗(opens in a new tab)
    Yes

Key votes are final decisions on bills and joint resolutions, and top nominations. Software sorts each into an issue from its official title, so check the roll call. All 674 votes →

Timeline

  1. Oct 10
    news
    WNDU reports Messmer faces Allen in District 8, seeking a second term

    WNDU reported that all nine Indiana congressional seats are contested and that incumbent Messmer faces Democrat Mary Allen in District 8 as he seeks a second term in Congress.

    All nine Indiana congressional seats are contested. Here's ... · Oct 10, 2026 (opens in a new tab)
  2. Oct 6
    news
    Early voting opens statewide in Indiana; Messmer's opponent holds Vincennes town hall

    Indiana early voting opened October 6, giving voters in the IN-8 race the opportunity to cast ballots ahead of the November 3 general election. Messmer's opponent, Mary Allen, held a Vincennes town hall the same day, according to WNIN.

    Early voting begins for Indiana's general election. What to know. · Oct 6, 2026 (opens in a new tab)
  3. Aug 27
    filing
    Messmer and Democrat Mary Allen confirmed on Indiana IN-8 general-election ballot

    Indiana's 2026 general-election candidate list, as summarized by The Ballot Brief, listed Republican incumbent Messmer and Democrat Mary Allen for the November 3 ballot.

    47630 Sample Ballot: Warrick County, IN 2026 | The Ballot Brief · Sep 22, 2026 (opens in a new tab)
  4. Jun 30
    news
    Messmer reports $1.17M raised and $713,500 cash on hand through June 30

    FEC-based figures show Messmer raised $1,171,366, spent $664,972, and held $713,500 cash on hand through June 30. His Democratic opponent Mary Allen raised $294,502, spent $115,194, and held $179,308 cash on hand over the same period.

    Indiana's 8th District Race 2026: Who's Running (IN-8) · Oct 3, 2026 (opens in a new tab)
  5. May 5
    filing
    Messmer wins Republican primary nomination for Indiana's 8th Congressional District

    The party nominees for the November 3 general election were selected in the May 5 primary. Messmer secured the Republican nomination and will face Democrat Mary Allen on the general-election ballot.

    47630 Sample Ballot: Warrick County, IN 2026 | The Ballot Brief · Sep 22, 2026 (opens in a new tab)

Endorsements

  • Indiana Chamber of Commerce IBRG organization
    Listed on iVoterGuide's 2026 Republican primary profile as an endorsement received after the evaluation deadline; no individual date given. ivoterguide.com
  • National Rifle Association Political Victory Fund (NRA-PVF) organization
    Listed as an endorser in iVoterGuide's 2026 general-election candidate profile; no endorsement date given. ivoterguide.com
  • Susan B. Anthony List / Susan B. Anthony Pro-Life America organization
    Both names appear in iVoterGuide's 2026 general-election candidate profile endorsement list; no endorsement date given. ivoterguide.com
  • Huck PAC organization
    Listed by iVoterGuide in the 2026 general-election candidate profile; no date given. ivoterguide.com
  • Indiana Farm Bureau organization
    Listed by iVoterGuide; WNIN also reported Messmer had the Farm Bureau's endorsement without giving a date. ivoterguide.com
  • American Israel Public Affairs Committee (AIPAC PAC) organization
    Listed by iVoterGuide in the 2026 general-election candidate profile; no endorsement date given. ivoterguide.com
  • Council on American Exceptionalism organization
    Listed by iVoterGuide in the 2026 general-election candidate profile; no date given. ivoterguide.com
  • Indiana Right to Life organization
    WNIN reported Messmer had the group's endorsement; no date provided. news.wnin.org
  • House Conservatives Fund organization
    Listed on iVoterGuide's 2026 Republican primary profile as an endorsement received after the evaluation deadline; no individual date given. ivoterguide.com
  • Republican Jewish Coalition PAC organization
    Listed on iVoterGuide's 2026 Republican primary profile as an endorsement received after the evaluation deadline; no individual date given. ivoterguide.com
  • U.S. Chamber of Commerce organization
    Listed on iVoterGuide's 2026 Republican primary profile as an endorsement received after the evaluation deadline; no individual date given. ivoterguide.com
  • Donald Trump, President of the United States official
    Trump endorsed Messmer on May 5, 2026; Messmer won his primary after receiving the endorsement; WFYI also described Messmer as backed by Trump. trumpstruth.org · May 5, 2026

Campaign finance

Totals filed with the Federal Election Commission for the 2026 election cycle.

Raised
$1.17M
Spent
$665K
Cash on hand
$714K

As of Jun 30, 2026. Filings are periodic, so recent money may not be included yet. ↳ FEC record H4IN08249(opens in a new tab)

Sources 17

  1. [1] All nine Indiana congressional seats are contested. Here's ...(opens in a new tab) Oct 10, 2026
  2. [2] Voter Guide Profile for IN U.S. Rep., Dist. 8 candidate - Mark Messmer(opens in a new tab) Oct 9, 2026
  3. [3] Early voting begins for Indiana's general election. What to know.(opens in a new tab) Oct 6, 2026
  4. [4] Indiana's 8th District Race 2026: Who's Running (IN-8)(opens in a new tab) Oct 3, 2026
  5. [5] US House District 8 — highest profile race for southwestern ...(opens in a new tab) Sep 30, 2026
  6. [6] Representative Mark B. Messmer(opens in a new tab) Sep 24, 2026
  7. [7] 47630 Sample Ballot: Warrick County, IN 2026 | The Ballot Brief(opens in a new tab) Sep 22, 2026
  8. [8] Mark Messmer(opens in a new tab) Sep 17, 2026
  9. [9] Messmer Hosts Tax Event Highlighting the Benefits of the One Big Beautiful Bill(opens in a new tab) Aug 21, 2026
  10. [10] Champions of Rural America: Rep. Mark Messmer of Indiana Highlights Farm Bill Priorities for Rural America(opens in a new tab) May 22, 2026
  11. [11] Donald J. Trump: "" - Trump's Truth(opens in a new tab) May 5, 2026
  12. [12] Four Democrats compete for the chance to challenge Rep. Mark Messmer in Indiana's 8th Congressional District(opens in a new tab) Apr 17, 2026
  13. [13] Messmer Applauds Passage of the SAVE America Act in the House ...(opens in a new tab) Feb 12, 2026
  14. [14] Messmer Celebrates the 2026 March for Life with Remarks in ...(opens in a new tab) Jan 23, 2026
  15. [15] Press Releases | U.S. Representative Mark Messmer(opens in a new tab) Nov 20, 2025
  16. [16] Messmer and Stauber Thank National Guard Troops with ...(opens in a new tab) Sep 18, 2025
  17. [17] News List | U.S. Representative Mark Messmer(opens in a new tab) Jul 3, 2025
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