Colorado State Senate District 1

Tue, Nov 3 · Represented by Byron Pelton Republican · Member list as of Oct 28

Jamie JefferyDemocratic

No published poll names both candidates.Last result · 2022 general: Byron Pelton (R) 100.0

Byron PeltonRepublican · Incumbent4 years since first win

Last election: Byron Pelton (Republican) was unopposed, 2022
On the 2026 ballot: 2 candidates

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Side by side

Left column: JefferyRight column: Pelton

Donor-based spectrum: LiberalCentristConservativePeltonNo published score for Jeffery
Races: None listed; Won 1 of 1
Years since first win: Not available; 4

How these are counted

The spectrum is a published research score, not our rating. How this works. Wins and losses count the races in our results files, the same as each profile.

More about this race

Candidates on the ballot

Jamie JefferyDemocratic
Byron PeltonIncumbentRepublican

Source: coloradosos.gov (XLSX), dated Sep 15

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Official results for Colorado

History (14 elections for this seat)

Colorado Senate District 1, 1970 to 2022, 2022, every candidate
Candidate	Party	Votes and share	Share
RepublicanByron PeltonWon	Republican	53,199100.0%	100.0%

Votes for listed candidates: 66,205
Election day: November 6, 2018
District map: Older district map (2012 to 2021)

Colorado Senate District 1, 1970 to 2022, 2018, every candidate
Candidate	Party	Votes and share	Share
RepublicanJerry SonnenbergWon(incumbent)	Republican	52,31179.0%	79.0%
DemocraticDebra Gustafson	Democratic	13,89421.0%	21.0%

Colorado Senate District 1, 1970 to 2022, 2014, every candidate
Candidate	Party	Votes and share	Share
RepublicanJerry SonnenbergWon	Republican	45,68985.3%	85.3%
OtherDoug Aden	Other	7,87614.7%	14.7%

Votes for listed candidates: 44,712
Election day: November 2, 2010
District map: Older district map (2002 to 2011)

Colorado Senate District 1, 1970 to 2022, 2010, every candidate
Candidate	Party	Votes and share	Share
RepublicanGreg BrophyWon(incumbent)	Republican	34,63277.5%	77.5%
DemocraticMichael Bowman	Democratic	10,08022.5%	22.5%

Colorado Senate District 1, 1970 to 2022, 2006, every candidate
Candidate	Party	Votes and share	Share
RepublicanGreg BrophyWon	Republican	29,50571.4%	71.4%
DemocraticJames L. Bowen	Democratic	11,83328.6%	28.6%

Votes for listed candidates: 41,009
Election day: November 5, 2002
District map: Older district map (2002 to 2011)

Colorado Senate District 1, 1970 to 2022, 2002, every candidate
Candidate	Party	Votes and share	Share
RepublicanMark D. HillmanWon(incumbent)	Republican	30,11273.4%	73.4%
DemocraticMark Benner	Democratic	9,94124.2%	24.2%
LibertarianJayne Bass	Libertarian	9562.3%	2.3%

Votes for listed candidates: 36,724
Election day: November 3, 1998
District map: Older district map (1992 to 2001)

Colorado Senate District 1, 1970 to 2022, 1998, every candidate
Candidate	Party	Votes and share	Share
RepublicanMarilyn N. MusgraveWon	Republican	23,07362.8%	62.8%
DemocraticSue Jarrett	Democratic	13,65137.2%	37.2%

Colorado Senate District 1, 1970 to 2022, 1994, every candidate
Candidate	Party	Votes and share	Share
RepublicanDon AmentWon(incumbent)	Republican	28,125100.0%	100.0%

Colorado Senate District 1, 1970 to 2022, 1990, every candidate
Candidate	Party	Votes and share	Share
RepublicanDon AmentWon	Republican	28,03777.5%	77.5%
DemocraticViola Johnson	Democratic	8,11722.4%	22.4%

Votes for listed candidates: 30,764
Election day: November 4, 1986
District map: Older district map (1982 to 1991)

Colorado Senate District 1, 1970 to 2022, 1986, every candidate
Candidate	Party	Votes and share	Share
RepublicanJames L. BrandonWon(incumbent)	Republican	17,24156.0%	56.0%
DemocraticJames P. Brophy	Democratic	13,52344.0%	44.0%

Votes for listed candidates: 30,714
Election day: November 2, 1982
District map: Older district map (1982 to 1991)

Colorado Senate District 1, 1970 to 2022, 1982, every candidate
Candidate	Party	Votes and share	Share
RepublicanJames L. BrandonWon	Republican	16,97655.3%	55.3%
DemocraticMelba Hastings	Democratic	13,73844.7%	44.7%

Votes for listed candidates: 15,034
Election day: November 7, 1978
District map: Older district map (1972 to 1981)

Colorado Senate District 1, 1970 to 2022, 1978, every candidate
Candidate	Party	Votes and share	Share
DemocraticDennis GallagherWon(incumbent)	Democratic	11,66577.6%	77.6%
RepublicanRay Fenster	Republican	3,36922.4%	22.4%

Votes for listed candidates: 18,026
Election day: November 4, 1974
District map: Older district map (1972 to 1981)

Colorado Senate District 1, 1970 to 2022, 1974, every candidate
Candidate	Party	Votes and share	Share
DemocraticDennis GallagherWon	Democratic	13,11472.8%	72.8%
RepublicanGeorge Burke	Republican	4,91227.3%	27.3%

Colorado Senate District 1, 1970 to 2022, 1970, every candidate
Candidate	Party	Votes and share	Share
DemocraticBen KleinWon	Democratic	8,35058.0%	58.0%
RepublicanDavid Shortridge	Republican	6,05342.0%	42.0%

1970 to 2022: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), retrieved Oct 28, 2026. Compiled by Carl Klarner (Harvard Dataverse) from official returns; not an official source

Only part of this chamber is up in a given cycle. Which districts vote on which date is not on file. Last contest in this district on file: 2022.

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Election Wrld. (2026). Colorado State Senate District 1, election results 1970 to 2022. https://www.electionwrld.com/co/senate/1. Retrieved October 31, 2026.

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Sources

Sources: Census TIGERweb Legislative MapServer (120th CDs layer 0, 119th CDs layer 4, 2026 SLD upper layer 1 and lower layer 2) (US Census Bureau, public domain), retrieved Oct 28, 2026; Open Civic Data division identifiers (census_autogenerated us_sldl/us_sldu and openstates state files); also (sld-recent.json): Open Civic Data division identifiers (country-us) (CC0 (repository); also (sld-recent.json): CC0 1.0), retrieved Oct 28, 2026; Open States people (current) CSVs (CC0-1.0 (Open States people data)), retrieved Oct 28, 2026, compiled by Open States volunteers and staff (rosters from state legislature sites) from official returns, not an official source; State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse) (CC0 1.0), retrieved Oct 28, 2026, compiled by Carl Klarner (Harvard Dataverse) from official returns, not an official source.

District id: ocd-division/country:us/state:co/sldu:1

DataState data (JSON)Sources: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), DIME (ODC-BY)Data as of Oct 28, 2026