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Member brief · 119th Congress

Rep. Mark B. Messmer

R · Republican · U.S. Representative, Indiana 8th District1

In Congress
Since 2025 · 1 year
 Next election
Nov 3, 2026
 Committee leadership
None

CommitteesAgriculture; Armed Services; Education and Workforce2

Participation3

98 / 100

Chamber median 98
661 of 674 roll calls

Party unity3

99 / 100

Chamber median 98
on 467 party-line votes

Cross-party agreement3

13 / 100

Chamber median 12
on 522 contested votes

Ideology score4

+0.54

Chamber median +0.19
−1 left · +1 right

Notable votes and votes by issue

In the full brief: five notable recent votes chosen by a fixed rule (most recent breaks with party first), each with the member’s vote, the party’s position and a source, plus how often Messmer votes with the party on each issue.

Full briefs are part of Oathstar Pro. Team plans add alignment with your own scorecard and your PAC’s giving.

Money and lobbying

In the full brief: how many of Messmer’s PACs belong to organizations that lobbied on bills Messmer voted on or cosponsored, with the dollars beside the chamber median; the top bills; campaign totals and the top PACs.

Full briefs are part of Oathstar Pro.

Votes most like5

R Mike Johnson LA-4 100% of 429
R Matt Van Epps TN-7 99% of 293
R Dan Crenshaw TX-2 99% of 479

Share of roll calls both voted on where they voted the same way.

Next race

Nov 3, 2026 · Filed for re-election6

Others filed for this seat

Mary Theresa AllenDemocratic Party

Data as of Nov 4, 2026 · votes through Sep 16, 2026 · Method: https://oathstar.com/methodology · Live profile: https://oathstar.com/people/mark-b-messmer

  1. 1. Member record and terms: congress.gov; unitedstates/congress-legislators, retrieved 2026-11-04. www.congress.gov/people/M001233
  2. 2. Committees: unitedstates/congress-legislators, retrieved 2026-11-04. github.com/unitedstates/congress-legislators
  3. 3. Participation, party unity, cross-party agreement, votes by issue: Oathstar from Voteview roll calls, 119th Congress, retrieved 2026-11-04. voteview.com/person/22540
  1. 4. Ideology: DW-NOMINATE first dimension, Voteview, 119th Congress. voteview.com/person/22540
  2. 5. Votes most like: Oathstar from Voteview roll calls, 119th Congress. voteview.com/data
  3. 6. Candidates: FEC filings, 2026 IN-8 race, retrieved 2026-11-05. www.fec.gov/data/elections/house/IN/08/2026/

Prepared with Oathstar · oathstar.com

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