Nonpartisan · Data from OpenStates / Plural Policy · Montana
MT
Democratic
· Representative
Mark Thane
Represents District 89 in the House of Representatives.
Votes with Democrats
93%
on 1,005 party-line votes · House Democrats median 95%
Cast a vote
98%
Yea or Nay on 3,174 of 3,248 roll calls · House median 99%
Their bills that became law
2 of 5
as a primary sponsor, this session · Democrats median 2
Roll calls on record
3,248
2025 Regular Session
Votes and bills updated Oct 5, 2026 from LegiScan (CC BY 4.0), which republishes the legislature’s own records. Profile details from OpenStates / Plural Policy. Figures cover 2025 Regular Session.
How Mark Thane votes
A party-line vote is a roll call where most voting Democrats and most voting Republicans took opposite sides. Absences and not-voting are never counted. Same method as our Congress pages.
Where Mark Thane sits in the House
Each dot is one member of the House, placed by how often they voted on the Democratic side of party-line votes. Mark Thane is circled.
Always on the Republican sideAlways on the Democratic side
Times they broke with their party
67 of 1,005 party-line votes, most recent 10 shown.
HB863 · Generally revise state finance laws
(H) 3rd Reading Passed as Amended by Senate · 2025-04-30 · Passed 55–45 · most Democrats voted the other way
SB324 · Revise vehicle registration fees and allocate revenue for bridges and victims of crime
(H) 3rd Reading Conference Committee Report Adopted · 2025-04-30 · Passed 57–43 · most Democrats voted the other way
SB40 · Revise supreme court public records laws by opening deliberations and files to the public
(H) 3rd Reading Free Conference Committee Report Adopted · 2025-04-30 · Passed 77–23 · most Democrats voted the other way
HB231 · Revise property tax rates for certain property
(H) 3rd Reading Conference Committee Report Adopted · 2025-04-30 · Passed 60–39 · most Democrats voted the other way
SJ28 · Interim study resolution on the legislature's ethics processes
(H) 3rd Reading Concurred · 2025-04-29 · Passed 61–38 · most Democrats voted the other way
HB863 · Generally revise state finance laws
(H) 2nd Reading Senate Amendments Not Concurred · 2025-04-29 · Failed 38–62 · most Democrats voted the other way
HB924 · Generally revise state finance laws
(H) 3rd Reading Passed as Amended by Senate · 2025-04-29 · Passed 60–39 · most Democrats voted the other way
SB535 · Revise laws related to experimental treatments
(H) Reconsidered Previous Action; Remains in 3rd Reading Process · 2025-04-25 · Passed 50–48 · most Democrats voted the other way
HB846 · Revising property taxation for certain local government subdivisions
(H) 3rd Reading Passed as Amended by Senate · 2025-04-25 · Passed 70–30 · most Democrats voted the other way
SB535 · Revise laws related to experimental treatments
(H) 3rd Reading Concurred · 2025-04-25 · Passed 49–48 · most Democrats voted the other way
Closest votes they cast
Roll calls decided by the fewest votes, one per bill.
SB535 · Revise laws related to experimental treatments
(H) 3rd Reading Failed · 2025-04-25 · Failed 50–50
HJ67 · Study resolution on impacts of federal funding changes on OPI and OCHE
(H) 2nd Reading Not Passed · 2025-04-25 · Failed 50–50
SB287 · Generally revise state finance laws
(H) 2nd Reading Not Concurred · 2025-04-24 · Failed 50–50
SB326 · Generally revise laws related to MEDIA Act film tax credits
(H) Reconsidered Previous Action; Placed on 2nd Reading · 2025-04-18 · Failed 49–49
SB312 · Generally revise laws for crime victims
(H) 2nd Reading Not Concurred · 2025-04-14 · Failed 50–50
Republicans they vote with most
Share of contested roll calls (the losing side got at least 10%) where both voted and landed on the same side. Unanimous votes are left out, because on those everyone agrees.
Thedis CroweRepublican · District 15 · 1,371 shared contested votes
87%
Scott DeMaroisRepublican · District 15 · 1,540 shared contested votes
86%
Sidney FitzpatrickRepublican · District 35 · 1,467 shared contested votes
85%
Their session, month by month
Dark bars are roll calls they were recorded on each month; the red part is the ones without a Yea or Nay (74 in all). Gaps are months the chamber wasn’t voting.
← Montana Delegation
YeaYeaYeaYeaYeaYeaNayYeaAbsentYeaNayYeaYeaYeaYeaYeaNayNayYeaYeaNayYeaYeaYeaYeaNayNayNayYeaYeaNayYeaYeaYeaYeaYeaNayNayYeaYeaYeaYeaYeaYeaNayNayYeaNayYeaYeaNayNayYeaNayYeaYeaNayYeaYeaYea
Their bills, from filing to law
Bills Mark Thane was a primary sponsor of this session. Most bills from either party never leave committee; in Illinois many never get past the Assignments or Rules committee.
Introduced5
Out of committee3
Passed one chamber3
Passed both chambers2
Became law2
Never left committee0
For comparison, the median Democratic member of the House has 2 bills that became law this session.
What their bills are about
State Finance 2Appropriations 2Energy 1Health Care Services 1Health 1Privacy 1
Create the early childhood education and child care infrastructure grant program
Failed(H) Died in Process · 2025-05-20
Generally revise digital asset mining and data center ratemaking laws
Failed(H) Died in Process · 2025-05-20
Interim study on transferring fiscal note production from executive branch to legislative branch
Became law(H) Filed with Secretary of State · 2025-05-06
Revise laws related to privacy in mental health digital service
Became lawChapter Number Assigned · 2025-05-05
Descriptions are the legislature’s own synopsis. Bill data from LegiScan, CC BY 4.0.
Loading committees…
SJ35 · 2025-04-30
Interim study of voter list maintenance and integrity ((H) 2nd Reading Concurred)
SB324 · 2025-04-30
Revise vehicle registration fees and allocate revenue for bridges and victims of crime ((H) 2nd Reading Conference Committee Report Adopted)
HB381 · 2025-04-30
Provide for educational credit for students volunteering in long term care, nursing home, home care, and child care settings ((H) 3rd Reading Governor's Proposed Amendments Adopted)
SJ37 · 2025-04-30
Interim survey of behavioral health services in Montana ((H) 3rd Reading Concurred)
SJ36 · 2025-04-30
Study dependent neglect standards for prosecutors ((H) 3rd Reading Concurred)
HB850 · 2025-04-30
Provide licensing and regulation of community health workers ((H) 3rd Reading Passed as Amended by Senate)
HB818 · 2025-04-30
Ban foreign funding for ballot measures ((H) 3rd Reading Conference Committee Report Adopted)
SB446 · 2025-04-30
Revise laws related to healthcare utilization review ((H) 3rd Reading Free Conference Committee Report Adopted)
HB936 · 2025-04-30
Authorize transfers and other necessary measures to implement HB 2-Section B ((H) 3rd Reading Passed as Amended by Senate)
HB231 · 2025-04-30
Revise property tax rates for certain property ((H) 2nd Reading Conference Committee Report Adopted)
HB231 · 2025-04-30
Revise property tax rates for certain property ((H) 3rd Reading Conference Committee Report Adopted)
SB40 · 2025-04-30
Revise supreme court public records laws by opening deliberations and files to the public ((H) 3rd Reading Free Conference Committee Report Adopted)
SB524 · 2025-04-30
Revise laws relating to category D assisted living facilities ((H) 3rd Reading Conference Committee Report Adopted)
HB853 · 2025-04-30
Revise fees for licensed establishments ((H) 3rd Reading Passed as Amended by Senate)
HB2 · 2025-04-30
General Appropriations Act ((H) 3rd Reading Passed as Amended by Senate)
HB932 · 2025-04-30
Generally revise conservation financing laws ((H) 3rd Reading Passed as Amended by Senate)
SJ48 · 2025-04-30
Interim study of the public health and safety impacts of marijuana legalization ((H) 2nd Reading Concurred)
SJ48 · 2025-04-30
Interim study of the public health and safety impacts of marijuana legalization ((H) 3rd Reading Concurred)
HB513 · 2025-04-30
Revise laws related to use of name, voice, and likeness of individuals and penalties for unauthorized use ((H) 3rd Reading Governor's Proposed Amendments Adopted)
SJ46 · 2025-04-30
Interim study of food security and agricultural prosperity ((H) 2nd Reading Not Concurred)
HB505 · 2025-04-30
Allow Montana housing infrastructure revolving loan fund to retain its interest and income and provide for fund transfers ((H) 3rd Reading Passed as Amended by Senate)
SJ49 · 2025-04-30
Interim study of youth and family behavioral health prevention ((H) 2nd Reading Concurred)
SJ49 · 2025-04-30
Interim study of youth and family behavioral health prevention ((H) 3rd Reading Concurred)
HB913 · 2025-04-30
Authorize transfers and other necessary measures to implement HB2 Section D ((H) 3rd Reading Passed as Amended by Senate)
SB319 · 2025-04-30
Generally revise health care laws related to doulas ((H) 3rd Reading Conference Committee Report Adopted)
SB324 · 2025-04-30
Revise vehicle registration fees and allocate revenue for bridges and victims of crime ((H) 3rd Reading Conference Committee Report Adopted)
HB682 · 2025-04-30
Generally revise laws regarding gender transition treatment ((H) 3rd Reading Free Conference Committee Report Adopted)
HB329 · 2025-04-30
Make the Montana ammunition act permanent ((H) 3rd Reading Conference Committee Report Adopted)
SB472 · 2025-04-30
Revise penalties for violations under 310 permit process ((H) 3rd Reading Free Conference Committee Report Adopted)
HB863 · 2025-04-30
Generally revise state finance laws ((H) 2nd Reading Senate Amendments Concurred)
HB863 · 2025-04-30
Generally revise state finance laws ((H) 3rd Reading Passed as Amended by Senate)
SJ42 · 2025-04-30
Interim study of noxious weed control ((H) 2nd Reading Concurred)
SJ42 · 2025-04-30
Interim study of noxious weed control ((H) 3rd Reading Concurred)
HB935 · 2025-04-30
Limits to Fox Hills-Hell Creek aquifer withdrawals ((H) 3rd Reading Passed as Amended by Senate)
HJ34 · 2025-04-30
Resolution supporting Montana's beef producers ((H) 3rd Reading Passed as Amended by Senate)
HB117 · 2025-04-30
Establish criminal justice data warehouse priorities ((H) 3rd Reading Free Conference Committee Report Adopted)
SJ35 · 2025-04-30
Interim study of voter list maintenance and integrity ((H) 3rd Reading Concurred)
HB936 · 2025-04-29
Authorize transfers and other necessary measures to implement HB 2-Section B ((H) 2nd Reading Senate Amendments Concurred)
HB511 · 2025-04-29
Provide grant funding for firefighting training facilities ((H) 3rd Reading Passed as Amended by Senate)
HB935 · 2025-04-29
Limits to Fox Hills-Hell Creek aquifer withdrawals ((H) 2nd Reading Senate Amendments Concurred)
HJ72 · 2025-04-29
Interim study of personal data sharing by DOT ((H) 3rd Reading Passed)
HB12 · 2025-04-29
Montana historic preservation grants ((H) 3rd Reading Passed as Amended by Senate)
HB932 · 2025-04-29
Generally revise conservation financing laws ((H) 2nd Reading Senate Amendments Concurred)
HB5 · 2025-04-29
Long-range building appropriations ((H) 3rd Reading Passed as Amended by Senate)
HB4 · 2025-04-29
Appropriations by budget amendment ((H) 3rd Reading Passed as Amended by Senate)
HB505 · 2025-04-29
Allow Montana housing infrastructure revolving loan fund to retain its interest and income and provide for fund transfers ((H) 2nd Reading Senate Amendments Concurred)
HB513 · 2025-04-29
Revise laws related to use of name, voice, and likeness of individuals and penalties for unauthorized use ((H) 2nd Reading Governor's Proposed Amendments Adopted)
HB913 · 2025-04-29
Authorize transfers and other necessary measures to implement HB2 Section D ((H) 2nd Reading Senate Amendments Concurred)
SB319 · 2025-04-29
Generally revise health care laws related to doulas ((H) 2nd Reading Conference Committee Report Adopted)
HB682 · 2025-04-29
Generally revise laws regarding gender transition treatment ((H) 2nd Reading Free Conference Committee Report Adopted)
SB218 · 2025-04-29
Provide for private right of action for injuries caused by certain medical interventions to treat gender dysphoria ((H) Reconsidered Previous Action; Placed on 2nd Reading)
HB924 · 2025-04-29
Generally revise state finance laws ((H) 3rd Reading Passed as Amended by Senate)
HB381 · 2025-04-29
Provide for educational credit for students volunteering in long term care, nursing home, home care, and child care settings ((H) 2nd Reading Governor's Proposed Amendments Adopted)
HB446 · 2025-04-29
Revise indecent exposure laws ((H) 3rd Reading Governor's Proposed Amendments Adopted)
SJ46 · 2025-04-29
Interim study of food security and agricultural prosperity ((H) Business and Labor–Be Concurred In)
SJ37 · 2025-04-29
Interim survey of behavioral health services in Montana ((H) 2nd Reading Concurred)
SJ34 · 2025-04-29
Interim study of child care ((H) 2nd Reading Not Concurred)
SJ33 · 2025-04-29
Interim study of the prescription drug supply chain ((H) 3rd Reading Concurred)
HB850 · 2025-04-29
Provide licensing and regulation of community health workers ((H) 2nd Reading Senate Amendments Concurred)
SJ36 · 2025-04-29
Study dependent neglect standards for prosecutors ((H) 2nd Reading Concurred)
Complete voting record from LegiScan (showing the 60 most recent of 3248 total roll-call votes this session).
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