Riding profile

CO-4

US House district — CO · Mixed · us co

The question

CO-4: who wins this toss-up?

Current forecast

Republican

Toss-up

Probability
81%
Mean margin (pts)
2.2
P(close race)
94%

Projected vote share

Projection by party

  • Republican 49.6%

    Lauren Boebert incumbent

  • Democrat 47.8%

    Eileen Laubacher

  • Other 2.5%

    Timothy Veldhuizen

Watch list

The tightest races

Smallest projected margin. Open one for the numbers.

  1. FL-22Democrat68 %1.1 pt margin
  2. AZ-2Republican57 %1.1 pt margin
  3. OH-10Democrat60 %1.1 pt margin

In context

How this riding stacks up

Republican Democrat Other
HereCO-4 49.6%47.8%2.5%
National averageUnited States 44.9% +4.7 54.3% −6.5 5.1% −2.6

Nationwide averages computed across the 435 riding-level projections (unweighted mean).

Projection track

How the projection has moved

Editorial read

CO-4, a mixed riding in CO, elected a member with the Republicans in the previous cycle, with a 12-point margin. The Vote-Scope model projects the Republicans ahead at 50% vote share, against 48% for the Democrats, and the race could swing.

Sitting member

BOEBERT, LAUREN

Sits with Republican

Primary race

Primary results

Held Jun 30, 2026 · Certified official result

Democratic primary

Winner

Eileen Laubacher 100.0%

72,483 votes

Republican primary

Winner

Lauren Boebert 100.0%

92,651 votes

Official source →

Who's running

The candidates

Declared and on-ballot candidates for the upcoming election.

  • Republican Incumbent

    Boebert, Lauren

  • Democrat Challenger

    Laubacher, Eileen

  • Other Challenger

    Veldhuizen, Timothy

Previous election · 2024

Won by
Republican
Margin
11.6 pts
Margin shift vs current projection
-9.4 pts
Last model run
Cycle
us_house_2026