IL-12
Illinois District 12
Tue, Nov 3 · Seat held by Mike Bost Republican since Jan 2015
Mike BostRepublican · IncumbentAge 65 · 11 years in CongressJulie FortierDemocratic
No published poll names both candidates.Last result · 2024 general: Mike Bost (R) 74.2, Brian Roberts (D) 25.8
- Last election
- Mike Bost (Republican) won by 48.4 points, 2024
- Margin since 2022
- 1.6 points toward Democrats
- On the 2026 ballot
- 2 candidates
Side by side
Bost left, Fortier right- Total receipts, 2025-2026 cycle, through Oct 14
- $1.6M
- $159K
- Cash on hand
- $845K
- $34K
- Donor-based spectrum
- LiberalCentristConservativeBostNo published score for Fortier
- Record
- 16-1
- None on file
- Years in politics
- 11
- Not available
- Age on Election Day
- 65
- Not available
Mike Bost on fec.gov. Julie Fortier on fec.gov. One or more are matched to the FEC by name, party and seat, so a total could belong to someone else.
How these are counted
Total receipts line of each candidate’s principal campaign committee, 2025-2026 cycle. Other sites may show career, six-year or all-committee totals, which differ. The spectrum is a published research score, not our rating. How this works. Record is wins and losses in the races in our results files, the same count as each profile.
More about this race
Candidates on the ballot
- Julie FortierDemocratic
- Mike BostIncumbentRepublican
Party nominees only, not the certified ballot.
Source: elections.il.gov, dated Oct 28
Shift since 2022: 1.6 points toward Democrats (Republican by 50.0 in 2022, Republican by 48.4 in 2024).
All Illinois districts
Select a shape for details. Arrow keys move between shapes.
2024 US House margin
- D 15+ pts
- D 5 to 15 pts
- D under 5 pts
- R under 5 pts
- R 5 to 15 pts
- R 15+ pts
- Other winner
- No data
Show these districts as a list (17)
- Illinois District 1· Jonathan L. Jackson (D), Democratic by 31.7 points, 2024
- Illinois District 2· Robin L. Kelly (D), Democratic by 35.1 points, 2024
- Illinois District 3· Delia C. Ramirez (D), Democratic by 34.6 points, 2024
- Illinois District 4· Jesús G. "Chuy" García (D), Democratic by 40.2 points, 2024
- Illinois District 5· Mike Quigley (D), Democratic by 38.0 points, 2024
- Illinois District 6· Sean Casten (D), Democratic by 8.4 points, 2024
- Illinois District 7· Danny K. Davis (D), Democratic by 66.6 points, 2024
- Illinois District 8· Raja Krishnamoorthi (D), Democratic by 14.2 points, 2024
- Illinois District 9· Janice D. Schakowsky (D), Democratic by 36.8 points, 2024
- Illinois District 10· Bradley Scott Schneider (D), Democratic by 19.9 points, 2024
- Illinois District 11· Bill Foster (D), Democratic by 11.2 points, 2024
- Illinois District 12· Mike Bost (R), Republican by 48.4 points, 2024
- Illinois District 13· Nikki Budzinski (D), Democratic by 16.2 points, 2024
- Illinois District 14· Lauren Underwood (D), Democratic by 10.2 points, 2024
- Illinois District 15· Mary E. Miller (R), Republican by 99.0 points, 2024
- Illinois District 16· Darin LaHood (R), Republican by 99.8 points, 2024
- Illinois District 17· Eric Sorensen (D), Democratic by 8.8 points, 2024
Map settings
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History (25 elections for this seat)
- Votes for listed candidates
- 367,629
- Election day
- November 5, 2024
- District map
- Same as today
US House, Illinois District 12, 2024, every candidate Candidate Party Votes and share Share RepublicanMike BostWon Republican 272,75474.2% DemocraticBrian Roberts Democratic 94,87525.8% - Votes for listed candidates
- 291,171
- Election day
- November 8, 2022
- District map
- Same as today
US House, Illinois District 12, 2022, every candidate Candidate Party Votes and share Share RepublicanMike BostWon Republican 218,37975.0% DemocraticHomer "Chip" Markel Democratic 72,79125.0% OtherNancy Foster Other 10.0% - Votes for listed candidates
- 322,416
- Election day
- November 3, 2020
- District map
- Older district map (2012 to 2020)
US House, Illinois District 12, 2020, every candidate Candidate Party Votes and share Share RepublicanMike BostWon Republican 194,83960.4% DemocraticRaymond C Lenzi Democratic 127,57739.6% - Votes for listed candidates
- 261,543
- Election day
- November 6, 2018
- District map
- Older district map (2012 to 2020)
US House, Illinois District 12, 2018, every candidate Candidate Party Votes and share Share RepublicanMike BostWon Republican 134,88451.6% DemocraticBrendan Kelly Democratic 118,72445.4% GreenRandy Auxier Green 7,9353.0% - Votes for listed candidates
- 313,002
- Election day
- November 8, 2016
- District map
- Older district map (2012 to 2020)
US House, Illinois District 12, 2016, every candidate Candidate Party Votes and share Share RepublicanMike BostWon Republican 169,97654.3% DemocraticCharles "C J" Baricevic Democratic 124,24639.7% GreenPaula Bradshaw Green 18,7806.0% - Votes for listed candidates
- 209,738
- Election day
- November 4, 2014
- District map
- Older district map (2012 to 2020)
US House, Illinois District 12, 2014, every candidate Candidate Party Votes and share Share RepublicanMike BostWon Republican 110,03852.5% DemocraticWilliam L Enyart Democratic 87,86041.9% GreenPaula Bradshaw Green 11,8405.6% - Votes for listed candidates
- 303,949
- Election day
- November 6, 2012
- District map
- Older district map (2012 to 2020)
US House, Illinois District 12, 2012, every candidate Candidate Party Votes and share Share DemocraticWilliam L EnyartWon Democratic 157,00051.7% RepublicanJason Plummer Republican 129,90242.7% GreenPaula Bradshaw Green 17,0455.6% Scattered write-insName as filed: Writein Write-in 20.0% - Votes for listed candidates
- 202,705
- Election day
- November 2, 2010
- District map
- Older district map (2002 to 2010)
US House, Illinois District 12, 2010, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 121,27259.8% RepublicanTeri Newman Republican 74,04636.5% GreenRodger Jennings Green 7,3873.6% - Votes for listed candidates
- 298,181
- Election day
- November 4, 2008
- District map
- Older district map (2002 to 2010)
US House, Illinois District 12, 2008, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 212,89171.4% RepublicanTimmy Jay Richardson Jr Republican 74,38224.9% GreenRodger W Jennings Green 10,9073.7% Scattered write-insName as filed: Writein Write-in 10.0% - Votes for listed candidates
- 157,291
- Election day
- November 7, 2006
- District map
- Older district map (2002 to 2010)
US House, Illinois District 12, 2006, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 157,284100.0% Scattered write-insName as filed: Writein Write-in 70.0% - Votes for listed candidates
- 286,435
- Election day
- November 2, 2004
- District map
- Older district map (2002 to 2010)
US House, Illinois District 12, 2004, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 198,96269.5% RepublicanErin R Zweigart Republican 82,67728.9% LibertarianWalter B Steele Libertarian 4,7941.7% Scattered write-insName as filed: Writein Write-in 20.0% - Votes for listed candidates
- 190,020
- Election day
- November 5, 2002
- District map
- Older district map (2002 to 2010)
US House, Illinois District 12, 2002, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 131,58069.2% RepublicanDavid Sadler Republican 58,44030.8% - Votes for listed candidates
- 183,257
- Election day
- November 7, 2000
- District map
- Older district map (1992 to 2000)
US House, Illinois District 12, 2000, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 183,208100.0% Scattered write-insName as filed: Writein Write-in 490.0% - Votes for listed candidates
- 165,014
- Election day
- November 3, 1998
- District map
- Older district map (1992 to 2000)
US House, Illinois District 12, 1998, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 99,60560.4% RepublicanWilliam Melvin Price Republican 65,40939.6% - Votes for listed candidates
- 209,519
- Election day
- November 5, 1996
- District map
- Older district map (1992 to 2000)
US House, Illinois District 12, 1996, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 150,00571.6% RepublicanShapley R Hunter Republican 55,69026.6% LibertarianGeoffrey S Nathan Libertarian 3,8241.8% - Votes for listed candidates
- 153,810
- Election day
- November 8, 1994
- District map
- Older district map (1992 to 2000)
US House, Illinois District 12, 1994, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 101,39165.9% RepublicanJan Morris Republican 52,41934.1% - Votes for listed candidates
- 236,877
- Election day
- November 3, 1992
- District map
- Older district map (1992 to 2000)
US House, Illinois District 12, 1992, every candidate Candidate Party Votes and share Share DemocraticJerry F CostelloWon Democratic 168,76271.2% RepublicanMike Starr Republican 68,11528.8% - Votes for listed candidates
- 137,531
- Election day
- November 6, 1990
- District map
- Older district map (1982 to 1990)
US House, Illinois District 12, 1990, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 113,08182.2% OtherSteve Pedersen Other 24,45017.8% - Votes for listed candidates
- 220,682
- Election day
- November 8, 1988
- District map
- Older district map (1982 to 1990)
US House, Illinois District 12, 1988, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 165,91375.2% DemocraticJohn A Leonardi Democratic 54,76924.8% - Votes for listed candidates
- 114,580
- Election day
- November 4, 1986
- District map
- Older district map (1982 to 1990)
US House, Illinois District 12, 1986, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 89,04477.7% DemocraticJohn A Leonardi Democratic 25,53622.3% - Votes for listed candidates
- 205,119
- Election day
- November 6, 1984
- District map
- Older district map (1982 to 1990)
US House, Illinois District 12, 1984, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 159,58277.8% DemocraticEdward J Laflamme Democratic 45,53722.2% - Votes for listed candidates
- 130,701
- Election day
- November 2, 1982
- District map
- Older district map (1982 to 1990)
US House, Illinois District 12, 1982, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 86,48766.2% DemocraticDaniel G Defosse Democratic 40,10830.7% LibertarianJoan T Jarosz Libertarian 4,1013.1% Scattered write-insName as filed: Writein Write-in 50.0% - Votes for listed candidates
- 249,818
- Election day
- November 4, 1980
- District map
- Older district map (1972 to 1980)
US House, Illinois District 12, 1980, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 185,08074.1% DemocraticDavid McCartney Democratic 64,72925.9% Scattered write-insName as filed: Writein Write-in 90.0% - Votes for listed candidates
- 138,935
- Election day
- November 7, 1978
- District map
- Older district map (1972 to 1980)
US House, Illinois District 12, 1978, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 110,50379.5% DemocraticGilbert Bogen Democratic 28,42420.5% Scattered write-insName as filed: Writein Write-in 80.0% - Votes for listed candidates
- 208,553
- Election day
- November 2, 1976
- District map
- Older district map (1972 to 1980)
US House, Illinois District 12, 1976, every candidate Candidate Party Votes and share Share RepublicanPhilip M CraneWon Republican 151,89972.8% DemocraticEdwin L Frank Democratic 56,64427.2% Scattered write-insName as filed: Writein Write-in 100.0%
All rows: MIT Election Data and Science Lab, U.S. House 1976-2024, retrieved Oct 28, 2026
District numbers are reused after each redistricting, so rows on older lines cover different territory than today's Illinois District 12.
Download and cite
Cite this page
Election Wrld. (2026). Illinois District 12, US House results. https://www.electionwrld.com/il/congress/12. Retrieved October 30, 2026.
Embed this seat
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<p style="font-size:13px">Data: <a href="https://www.electionwrld.com">Election Wrld</a>, CC BY 4.0</p>Paste this into any web page. It shows the seat, its last result and the next election.
Sources
Sources
- Used for
- web/data/results/house/{ST}.json. The Dataverse API refuses this file behind a guestbook, so the identical file was taken from two public GitHub copies (Hackquantumcpp/snoutcounter-midterms-2026-model data/1976-2024-house.csv and sta199-f26/sta199-f26.github.io _data/gerrymander/1976-2024-house.tab), which are byte-identical to each other and match the md5 a9566ac393913a1af343284e837c17bb that Dataverse lists for dataset version 15.0 (2026-03-09). sha256 76eec42483ee9f0fc5cf6e377442c783d1ae6eefa929729fd6561a69bab47f2a.
- License
- CC0 1.0
- Retrieved
- October 28, 2026
- Link
- https://doi.org/10.7910/DVN/IG0UN2
- Used for
- cd.topo.json, sld/*.topo.json
- License
- US Census Bureau, public domain
- Retrieved
- October 28, 2026
- Link
- https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Legislative/MapServer
- Used for
- web/data/officials/congress.json (name, party, bioguide, official site, service start) and web/data/people (birth year, committees, social media handles and profile links; links only, nothing copied from the platforms). As-of: the files saved in data/raw/people on 2026-10-29.
- License
- CC0-1.0
- Retrieved
- October 28, 2026
- Link
- https://unitedstates.github.io/congress-legislators/legislators-current.json
DataState data (JSON)Sources: MIT Election Data and Science Lab, U.S. House 1976-2024, FEC, DIME (ODC-BY), Portraits: unitedstates/images (public domain)Data as of Oct 28, 2026