Nonpartisan · Data from OpenStates / Plural Policy · Missouri
Republican
· State Senator
Mike Henderson
Represents District 3 in the State Senate.
Votes with Republicans
97%
on 32 party-line votes · Senate Republicans median 97%
Cast a vote
98%
Yea or Nay on 195 of 200 roll calls · Senate median 96%
Their bills that became law
4 of 40
as a primary sponsor, this session · Republicans median 2
Roll calls on record
200
2026 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 2026 Regular Session.
How Mike Henderson 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 Mike Henderson sits in the Senate
Each dot is one member of the Senate, placed by how often they voted on the Democratic side of party-line votes. Mike Henderson is circled.
Always on the Republican sideAlways on the Democratic side
Times they broke with their party
1 of 32 party-line votes.
HB2097 · Changes a pilot agricultural education program in elementary schools to a statewide program
Senate: Third Reading · 2026-05-14 · Passed 19–12 · most Republicans voted the other way
Closest votes they cast
Roll calls decided by the fewest votes, one per bill.
SB999 · Modifies provisions relating to vulnerable persons
Senate: Third Reading · 2026-05-06 · Passed 18–14
SB938 · Modifies certain provisions relating to land surveying
Senate: Third Reading · 2026-02-26 · Passed 18–13
HB2097 · Changes a pilot agricultural education program in elementary schools to a statewide program
Senate: Third Reading · 2026-05-14 · Passed 19–12
HB2020 · Appropriates money for the expenses, grants, refunds, and distributions of the several departments and offices of state government
Senate: Conference Committee Report Adoption · 2026-05-06 · Passed 20–13
HJR173 · Proposes a constitutional amendment relating to taxation
Senate: Adopt Substitute · 2026-04-15 · Passed 18–11
Democrats 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.
Steve RobertsDemocrat · District 5 · 33 shared contested votes
64%
Stephen WebberDemocrat · District 19 · 66 shared contested votes
61%
Maggie NurrenbernDemocrat · District 17 · 66 shared contested votes
59%
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 (5 in all). Gaps are months the chamber wasn’t voting.
← Missouri Delegation
YeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYea
Their bills, from filing to law
Bills Mike Henderson 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.
Introduced40
Out of committee6
Passed one chamber6
Passed both chambers4
Became law4
Never left committee34
For comparison, the median Republican member of the Senate has 2 bills that became law this session.
Establishes the Uniform Public Expression Protection Act, which provides procedures for dismissal of actions based on public expression
Became lawSigned by Governor · 2026-07-13
Creates "Bentley and Mason's Law" relating to child maintenance orders for certain persons convicted of the offense of driving while intoxicated
Became lawSigned by Governor · 2026-07-13
Modifies provisions relating to public employee retirement systems
Became lawSigned by Governor · 2026-07-09
Modifies and creates new provisions relating to telecommunications infrastructure
Became lawSigned by Governor · 2026-07-09
Makes 7-hydroxymitragynine in certain amounts a Schedule I controlled substance
Not out of committeeInformal Calendar S Bills for Perfection · 2026-05-15
Modifies provisions relating to wireless emergency telephone service charges
Not out of committeeFormal Calendar S Bills for Perfection · 2026-05-15
Modifies provisions relating to grants for certain workforce training programs
Passed one chamberS Bills with H Amendments · 2026-05-15
Modifies cost of living adjustments for members of the Public School Retirement System and the Public Education Employee Retirement System
Not out of committeeSecond Read and Referred S Local Government, Elections and Pensions Committee · 2026-05-07
Modifies provisions relating to the Missouri Technology Corporation
Not out of committeeSecond Read and Referred S Economic and Workforce Development Committee · 2026-05-07
Establishes provisions relating to college and career readiness assessments
Not out of committeeSecond Read and Referred S Education Committee · 2026-05-07
Requires school districts and charter schools to install master key boxes at public schools and charter schools on or before July 1, 2028
Not out of committeeSecond Read and Referred S Education Committee · 2026-05-07
Modifies provisions relating to the use of certain tourism tax revenues
Not out of committeeVoted Do Pass S Economic and Workforce Development Committee · 2026-04-15
Modifies provisions relating to multidisciplinary adult protection teams
Not out of committeeHearing Conducted S Families, Seniors and Health Committee · 2026-04-15
Limits the sale or purchase of certain drugs
Not out of committeeSCS Voted Do Pass S Families, Seniors and Health Committee (4496S.02C) · 2026-04-08
Descriptions are the legislature’s own synopsis. Bill data from LegiScan, CC BY 4.0.
Loading committees…
HB2896 · 2026-05-15
Modifies provisions relating to the governing bodies of certain public institutions of higher education (Senate: Third Reading)
HB1696 · 2026-05-15
Modifies provisions relating to the right of sepulcher (Senate: Third Reading)
HB2397 · 2026-05-15
Modifies requirements for a dissolution of a public water supply district (Senate: Conference Committee Report Adoption)
HB2397 · 2026-05-15
Modifies requirements for a dissolution of a public water supply district (Senate: Third Reading)
HB2885 · 2026-05-15
Requires all proceeds from boating registrations to be deposited in the water patrol division fund and used exclusively for the water patrol division (Senate: Third Reading)
SB973 · 2026-05-15
Creates and modifies provisions relating to real estate transactions (Senate: Conference Committee Report Adoption)
SB973 · 2026-05-15
Creates and modifies provisions relating to real estate transactions (Senate: Third Reading)
SB973 · 2026-05-15
Creates and modifies provisions relating to real estate transactions (Senate: Third Reading)
SB1572 · 2026-05-15
Modifies provisions relating to public employee retirement systems (Senate: Third Reading)
SB1572 · 2026-05-15
Modifies provisions relating to public employee retirement systems (Senate: Third Reading)
HB2474 · 2026-05-15
Modifies provisions governing design-build contracts (Senate: Third Reading)
HB2474 · 2026-05-15
Modifies provisions governing design-build contracts (Senate: Third Reading)
SB1019 · 2026-05-15
Modifies several provisions relating to health care (Senate: Third Reading)
HB1768 · 2026-05-15
Modifies provisions relating to the classification of certain residential real property used for short-term rentals (Senate: Third Reading)
SB953 · 2026-05-15
Modifies provisions relating to environmental programs within the Department of Natural Resources (Senate: Third Reading)
HB1867 · 2026-05-15
Authorizes Joplin to increase a transient guest tax for tourism to no more than six percent upon a vote of the people (Senate: Third Reading)
HB3080 · 2026-05-15
Modifies the historic preservation tax credit and includes an emergency clause (Senate: Emergency Clause)
HB2292 · 2026-05-15
Modifies provisions relating to abuse and neglect reporting, including a requirement to report companion animal abuse (Senate: Third Reading)
HB1740 · 2026-05-14
Modifies provisions relating to driving while intoxicated (Senate: Third Reading)
HB2636 · 2026-05-14
Establishes the "Uniform Mortgage Modification Act" (Senate: Third Reading)
SB1544 · 2026-05-14
Modifies provisions relating to state designations (Senate: Third Reading)
SB1544 · 2026-05-14
Modifies provisions relating to state designations (Senate: Third Reading)
HB2097 · 2026-05-14
Changes a pilot agricultural education program in elementary schools to a statewide program (Senate: Third Reading)
SB905 · 2026-05-14
Modifies language relating to school protection officers and creates Missouri Rangers training program (Senate: Third Reading)
SB905 · 2026-05-14
Modifies language relating to school protection officers and creates Missouri Rangers training program (Senate: Third Reading)
HB2397 · 2026-05-14
Modifies requirements for a dissolution of a public water supply district (Senate: Third Reading)
HB2372 · 2026-05-13
Modifies provisions relating to health care (Senate: Third Reading)
HB1840 · 2026-05-13
Establishes an alert system to assist in the location of missing persons with developmental disabilities (Senate: Third Reading)
SB975 · 2026-05-13
Modifies provisions relating to ambulance districts (Senate: Third Reading)
HB2596 · 2026-05-13
Modifies provisions relating to health benefit plans (Senate: Third Reading)
HB3231 · 2026-05-13
Establishes the "Missouri Innovation, Public Safety, and Accountability Act" (Senate: Third Reading)
HB2819 · 2026-05-13
Modifies provisions relating to certain cash transactions requiring rounding to the nearest five cent denomination (Senate: Conference Committee Report Adoption)
HB2819 · 2026-05-13
Modifies provisions relating to certain cash transactions requiring rounding to the nearest five cent denomination (Senate: Conference Committee Report Adoption)
HB2819 · 2026-05-13
Modifies provisions relating to certain cash transactions requiring rounding to the nearest five cent denomination (Senate: Third Reading)
SB1470 · 2026-05-13
Modifies duties and functions of the Joint Committee on Legislative Research (Senate: Conference Committee Report Adoption)
SB1470 · 2026-05-13
Modifies duties and functions of the Joint Committee on Legislative Research (Senate: Third Reading)
SB1470 · 2026-05-13
Modifies duties and functions of the Joint Committee on Legislative Research (Senate: Third Reading)
HB2818 · 2026-05-12
Modifies provisions governing annexation of territory outside the boundaries of a city (Senate: Third Reading)
HB1839 · 2026-05-12
Establishes provisions relating to civil liability for publishing or distributing material harmful to minors on the internet (Senate: Third Reading)
SB878 · 2026-05-12
Modifies provisions relating to pharmaceutical drugs and devices (Senate: Third Reading)
HB2819 · 2026-05-12
Modifies provisions relating to certain cash transactions requiring rounding to the nearest five cent denomination (Senate: Third Reading)
HB1940 · 2026-05-12
Changes the law regarding advertisements and orders of publication in newspapers (Senate: Conference Committee Report Adoption)
HB2057 · 2026-05-12
Modifies provisions relating to the establishment of certain entertainment districts (Senate: Third Reading)
HB2508 · 2026-05-12
Allows for a search of the series LLC in the SoS Business Entity website and to obtain a certificate of good standing (Senate: Third Reading)
HB2576 · 2026-05-12
Creates several new state designations (Senate: Reconsider)
HB2576 · 2026-05-12
Creates several new state designations (Senate: Third Reading)
HB1940 · 2026-05-07
Changes the law regarding advertisements and orders of publication in newspapers (Senate: Third Reading)
SB1233 · 2026-05-07
Modifies provisions relating to activities requiring licensure (Senate: Third Reading)
HB1825 · 2026-05-07
Removes the prosecuting attorney and the sheriff from the county salary commission (Senate: Third Reading)
SB937 · 2026-05-07
Conveys certain state property (Senate: Third Reading)
SB937 · 2026-05-07
Conveys certain state property (Senate: Third Reading)
SB1694 · 2026-05-06
Authorizes incentives for downtown redevelopment (Senate: Third Reading)
HB2003 · 2026-05-06
Appropriates money for the expenses, grants, refunds, and distributions of the Department of Higher Education and Workforce Development (Senate: Conference Committee Report Adoption)
HB2003 · 2026-05-06
Appropriates money for the expenses, grants, refunds, and distributions of the Department of Higher Education and Workforce Development (Senate: Conference Committee Report Adoption)
HB2003 · 2026-05-06
Appropriates money for the expenses, grants, refunds, and distributions of the Department of Higher Education and Workforce Development (Senate: Conference Committee Report Adoption)
HB2003 · 2026-05-06
Appropriates money for the expenses, grants, refunds, and distributions of the Department of Higher Education and Workforce Development (Senate: Conference Committee Report Adoption)
Complete voting record from LegiScan (showing the 60 most recent of 200 total roll-call votes this session).
Primary Office
Sources:
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