Horizon · our Election Day forecast: polls, plus fundamentals like incumbency, fundraising and past results.

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What's the difference?

Colorado › U.S. House of Representatives · November 3, 2026 · Updated Oct 16, 2026

Colorado's 4th District

Boebert is clearly favored to win: Boebert wins in 5 of every 6 simulations.

Laubacher (D)
16%
chance of winning
Boebert (R)
84%
Average margin
R+6.3
80% of outcomes
R+15 to D+2
Partisan lean
R+19
Polls
1in our database

Boebert is very likely to win: Boebert wins in 19 of every 20 simulations.

Laubacher (D)
5%
chance of winning
Boebert (R)
95%
Average margin
R+11.8
80% of outcomes
R+21 to R+3
Partisan lean
R+19
Polls
1in our database

Range of outcomes

Final margin across our simulations; the white dashes mark the middle 80%.

R+6.3R+20R+10EvenD+10D+20
R+11.8R+30R+20R+10EvenD+10D+20D+30

How the odds have moved

Chance of winning by forecast date.

0%25%50%75%100%AugSepOctNovNov 3Laubacher 16%Boebert 84%

Updated nightly. Each day is the current model run on the polls that had ended by then (how).

0%25%50%75%100%AugSepOctNovNov 3Laubacher 5%Boebert 95%

Updated nightly. Each day is the current model run on the polls that had ended by then (how).

The candidates

Democratic

Eileen Laubacher

Retired United States Navy rear admiral and former U.S. National Security Council director

Experience
No elected office
Raised
$10.3M
From individuals
$10.3M
Spent
$6.7M
Cash on hand
$3.6M

Money: FEC, through Jun 30, 2026.

Profile and career · Wikipedia

RepublicanIncumbent

Lauren Boebert

Incumbent U.S. representative

Experience
Statewide office or Congress
Raised
$1M
From individuals
$797.1K
Spent
$922.2K
Cash on hand
$247.2K

Money: FEC, through Jun 30, 2026.

Profile and career · Wikipedia

What goes into the forecast

Every ingredient's estimate of the final margin.

National environment
D+9.5Election Day forecast; federal races run in it
Swing reaching this office
78%Of a shift in the environment, from past House races since 2016
Mountain West adjustment
+1.5How House races in the region have run against lean and environment lately
← RepublicanDemocratic →Lean + environmentUsual vote, shifted by 78% of the environment andthe Mountain West adjustmentR+9.7Fundamentals modelAdds incumbency, past results, money andexperienceR+2.3Polls in similar placesPolling of similar races in Colorado andlook-alike placesR+2.4Polling average1 poll, latest Sep 24R+11.3Horizon forecastPolls + fundamentals, projected to Election DayR+6.3Pulse forecastPolls (and polling of similar places) only, todayR+11.8

Each estimate is a margin before national and statewide uncertainty is simulated. Horizon blends polls, fundamentals and a little of the similar-places estimate, weighting each by how precise it is; Pulse uses polls and similar places only.

Fundamentals inputs
Incumbency (+1 D, −1 R)-1
Fundraising edge (log ratio of individual money)2.16
Elected-experience edge-1
First-term incumbent0
Seat's last result vs. expectation9.23
Incumbent's last result vs. expectation9.23

Polls

R+10R+5EvenD+5D+10Avg. R+11.3Sep 24Nov 3
All 1 polls
PollsterDatesSampleLaubacherBoebertMarginAdjusted
Impact Research for the Invest in Tomorrow Coalition PAC, which opposes BoebertD-sponsoredSep 21–Sep 24403 LV4045R+5R+11.3

Adjusted: after correcting for the pollster's house effect, registered vs. likely voters, and movement in the national environment since the poll; shown for the polls carrying the most weight in today's average. Larger dots in the chart carry the most weight. Last poll: Sep 24, 2026.

The district

Lean R+19: how much more Democratic or Republican than the nation it votes for president.

Presidential vote

← RepublicanDemocratic →2016 presidentR+29.9R+32.1 vs. nation2020 presidentR+19.0R+23.6 vs. nation2024 presidentR+18.7R+17.2 vs. nation

Precinct results re-aggregated to the current district lines.

Who lives here

Population
749,336
People per km²
9
Adults with a B.A.+
48%
White, no degree
38%of adults
  • White 74%
  • Hispanic 15%
  • Black 2%
  • Asian 4%
  • Other / multiracial 5%

American Community Survey 2020–2024, aggregated from census tracts.

Past results

Results in the same-numbered district; earlier elections may have used different lines.

2024

447,807 votes · R+12.1
✓ Lauren Boebert (R)53.6%
Trisha Calvarese (D)42.0%
Hannah Goodman (L)2.6%
Frank Atwood (OTH)1.4%

2024 President Vote in this district

449,986 two-party votes · R+18.7 · R+17.2 vs. the nation
✓ Donald Trump (R)59.4%
Kamala Harris (D)40.6%

2022

354,513 votes · R+25.0
✓ Ken Buck (R)60.9%
Ike McCorkle (D)36.6%
Ryan McGonigal (CST)2.5%

2020 Earlier district lines

475,107 votes · R+24.3
✓ Ken Buck (R)60.1%
Ike McCorkle (D)36.6%
Bruce Griffith (L)2.3%
Laura Ireland (OTH)1.0%

2020 President Vote in this district

429,172 two-party votes · R+19.0 · R+23.6 vs. the nation
✓ Donald Trump (R)59.5%
Joe Biden (D)40.5%

2018 Earlier district lines

369,620 votes · R+21.2
✓ Ken Buck (R)60.6%
Karen McCormick (D)39.4%

2016 Earlier district lines

390,635 votes · R+33.5
✓ Ken Buck (R)63.5%
Bob Seay (D)31.7%
Bruce Griffith (L)4.8%

2016 President Vote in this district

332,191 two-party votes · R+29.9 · R+32.1 vs. the nation
✓ Donald Trump (R)64.9%
Hillary Clinton (D)35.1%