99chambers
Leaving office January 1, 2027.Did not run for re-election in 2026. This page switches to the former-officeholder layout when the term ends.
RepublicanIn office until January 1, 2027

Don DeWitte

Illinois State Senator, District 33 since 2018. Did not run for re-election in 2026; leaves office in January 2027.

Illinois State Senator, District 33

Official websiteWikipedia

In office
7 yrs
Since 2018
Bills became law
9
47 sponsored, 2025–2026 session
Votes missed
2.5%
Chamber median 2.8%
With party
71%
On votes splitting the parties
Last margin
+1.2
Won 2018

Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET

Committees

As of 2026-10.

  • Environment and Conservation · republican spokesperson
  • Revenue · republican spokesperson
  • Transportation · ranking member
  • Appropriations
  • Committee on Administrative Rules
  • Education
  • Labor
  • State Government

Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET

Legislation

2025–2026 session · 47 sponsored · 9 became law
BillIntroCmteSenateHouseLaw
HB 5489 DOMESTIC VIOLENCE-JUVENILES
Became law Aug 2026
SB 3016 DNR-OSLAD ACCESSIBILITY
Became law Jul 2026
HB 1648 PEN CD-FIRE-PAYMENT REDIRECTS
Became law Aug 2025
HB 3141 EPA-WATER MAIN INSTALLATION
Became law Aug 2025
HB 2442 TRAFFIC SIGNAL PREEMPT DEVICE
Became law Aug 2025

Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET

Voting record

2025–2026 session · placement by roll-call votes

Where DeWitte sits in the Illinois State Senate

DeWitte is closer to the center than 84% of the chamber's Republicans.

Dem. medianRep. medianDeWitteMore liberalMore conservative

Closest: John Curran, Sue Rezin, Darby Hills

Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:50 PM ET

With DeWitte’s party

  • Votes with the chamber's Republicans71%
  • Cosponsorships of the other party's bills35%

Black tick: the average of Republicans in the Illinois State Senate.

Source: 99chambers legislative scores from roll calls and cosponsorships

Key votes

Votes chosen for their effect, not their side: DeWitte’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.

DateBillDeWitteRep. majorityDem. majorityResult
May 31, 2026HB 5090: PROCUREMENT-CONSTRUCTIONNoNoYesPassed 42–12
May 31, 2026HB 4379: ADULT CHANGING STATIONSYesNoYesPassed 46–12
May 31, 2026HB 4571: COUNTIES CD-AFFORDABLE HOUSINGNoNoYesPassed 44–14
May 29, 2026HB 4758: JOB APPLICATION-DRIVER LICENSENoNoYesPassed 41–15
May 29, 2026HB 4339: SCH CD-HIGH SCH-REGISTER VOTERNot votingNoYesPassed 41–12

Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls

Career

Offices held, and every time DeWitte was on a ballot. Filled marks are general elections won; hollow marks are primaries; an orange outline is a loss.

Source: 99chambers results archive (MEDSL, Klarner, state election offices)

Elections

Margin against the seat’s presidential baseline: how the seat voted for president in the same or nearest year.

YearRaceResultMargin
2022Illinois State Senate, District 33Won—
2018Illinois State Senate, District 33WonR+1.2

Source: 99chambers results archive

Seats DeWitte has held

Source: 99chambers results archive

Who DeWitte has run against

  • Nancy Zettler (D) · 2018 general, won

Source: 99chambers results archive

How we know DeWitte

One person, matched across every source we use.

Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET