Colorado's 4th District margin of victory
Short Answer
The model assigns meaningfully higher odds than the market for Republicans winning Colorado's 4th District by 2+ points (14.0% model vs 0.0% market), driven by its assessment that this remains the most likely outcome despite significant Democratic fundraising and a national environment favoring Democrats suggesting a tighter race.
1. Executive Verdict
- Democratic fundraising and national environment may tighten the race. CO-04 historically shows significant Republican electoral victories. Boebert's general election margin was narrower than Lopez's special election. Democratic challenger Eileen Laubacher has accumulated substantial campaign funds. Democrat Trisha Calvarese is reported seeking a rematch against Boebert. No specific 2026 CO-04 general election matchup polls are available.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| Republicans, 11+ pts | 20.0% | 8.0% | Democratic fundraising and a national environment favoring Democrats suggest a tighter race, reducing Republican margins. |
| Republicans, 14+ pts | 9.2% | 5.3% | Democratic fundraising and a national environment favoring Democrats suggest a tighter race, reducing Republican margins. |
| Republicans, 2+ pts | 0.0% | 14.0% | Democratic fundraising and a national environment favoring Democrats suggest a tighter race, reducing Republican margins. |
| Republicans, 5+ pts | 0.0% | 12.0% | Democratic fundraising and a national environment favoring Democrats suggest a tighter race, reducing Republican margins. |
| Republicans, 8+ pts | 0.0% | 10.0% | Democratic fundraising and a national environment favoring Democrats suggest a tighter race, reducing Republican margins. |
Current Context
Colorado's 4th District exhibits a strong Republican advantage in recent elections. The district holds a Cook Partisan Voting Index (PVI) of R+9, making it the 141st most Republican district nationally, and is rated as Solid/Safe Republican by major election handicappers including Cook Political Report, Sabato's Crystal Ball, and Inside Elections [^]. In the 2024 general election, Representative Lauren Boebert was projected to win with 53.6% of the vote, securing an 11.6 percentage point margin over challenger Ike Calvarese, who polled at 42% [^][^][^]. Furthermore, the 2024 special election in the district saw Republican Greg Lopez defeat Calvarese with a 24-point margin, 58.4% to 34.4% [^]. Prediction markets reflect this lean, with the Polymarket probability for a Republican win currently at 59%, a decrease from a previous 66% [^][^].
The 2026 Democratic primary features several candidates and significant fundraising efforts. The June 30 Democratic primary includes candidates such as Eileen Laubacher, Ike Calvarese, Peter Padora Jr., and Zach Preston [^]. Notably, Laubacher has demonstrated strong fundraising, raising a total of $6.4 million in Q1 2026, considerably more than Representative Boebert's $723,000 raised through 2025 [^][^].
2. Market Behavior & Price Dynamics
Historical Price (Probability)
Outcome probability
Date
This market's price action is defined by a single, dramatic upward movement. The price began at a low of 2.0% and remained in that range until a massive 57.0 percentage point spike occurred around May 6, 2026, vaulting the price from 3.0% to 60.0%. Since this event, the price has held steady at this new, higher level. The provided context, however, explicitly states that available sources do not support or explain this specific price spike on that date. While the general political landscape of Colorado's 4th District, with its R+9 PVI and "Solid Republican" rating, is consistent with a high GOP margin of victory, the specific timing and magnitude of this price jump are not attributed to any news or development in the provided information.
A critical observation from the chart data is the complete absence of trading volume, with zero contracts traded throughout the market's history. This lack of participation suggests the price movements do not reflect market conviction or consensus. The price may have been set by a market maker or a single unfilled offer rather than organic trading activity. Consequently, while the price has established a new plateau at 60.0%, this level cannot be considered a meaningful support or resistance level without trading to validate it. The chart's price level implies strong sentiment for a large Republican margin of victory, but the zero-volume reality indicates this is an illiquid market whose price is not currently a reliable indicator of collective expectation.
3. Significant Price Movements
Notable price changes detected in the chart, along with research into what caused each movement.
📈 May 06, 2026: 57.0pp spike
Price increased from 3.0% to 60.0%
Outcome: Republicans, 2+ pts
What happened: Available sources do not support a "57.0 percentage point spike" in the "Colorado's 4th District margin of victory" prediction market on May 6, 2026. The primary election for this district is scheduled for June 30, 2026, and the general election for November 3, 2026, making any definitive margin of victory determination or reported election results on May 6, 2026, inconsistent with the electoral calendar [^]. Without evidence of such a market movement occurring on that date, identifying a primary driver, including specific social media activity, is not possible. Therefore, social media activity appears irrelevant to the described event.
4. Market Data
Contract Snapshot
This market resolves to "Yes" if the Republican Party wins the 2026 U.S. House of Representatives election in Colorado's 4th District by 5 percentage points or more; otherwise, it resolves to "No." The margin is calculated as the Republican vote percentage minus that of the candidate/party finishing immediately behind them, with no rounding applied.
The market opened on May 5, 2026, and will close early if certified election results are published, or by November 3, 2027, at 11:00am EDT at the latest, with payouts projected 30 minutes after closing.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| Republicans, 11+ pts | $0.21 | $0.80 | 20% |
| Republicans, 14+ pts | $0.09 | $0.92 | 9% |
| Republicans, 2+ pts | $0.61 | $0.40 | 0% |
| Republicans, 5+ pts | $0.49 | $0.52 | 0% |
| Republicans, 8+ pts | $0.37 | $0.64 | 0% |
Market Discussion
Colorado's 4th Congressional District is a heavily Republican area, rated "Solid R" and R+9, where Lauren Boebert secured victory in the 2024 general election [^]. For the upcoming 2026 election, Boebert is running in the Republican primary scheduled for [June 30, 2026], facing discussions about vulnerability from a 2024 text poll, partly due to her recent move, and the potential for a consolidated "anti-Boebert" vote [^]. Democratic candidates are also active, but observers suggest a split Republican primary vote would likely benefit Boebert in this historically Republican district [^].
5. What Historical Precedents in CO-04 and Comparable R+9 Districts Support a Republican Margin Greater Than 11 Points?
| Cory Gardner 2010 Win Margin | 11.1 points (52.48% vs 41.35%) [^][^] |
|---|---|
| Ken Buck 2014 Win Margin | 35.5 points (64.67% vs 29.22%) [^][^] |
| CO-04 Cook PVI | R+9 [^][^] |
CO-04 has a history of significant Republican electoral victories. Colorado's 4th Congressional District (CO-04), with a Cook Partisan Voting Index (PVI) rating of R+9, has historically shown a capacity for Republican candidates to win by margins exceeding 11 points [^][^]. A notable example is Cory Gardner's 2010 victory, where he secured an 11.1-point lead with 52.48% of the vote against Betsy Markey's 41.35% [^][^]. Four years later, Ken Buck achieved an even more substantial win in 2014, leading by 35.5 points with 64.67% of the vote compared to Vic Meyers' 29.22% [^][^].
Not all Republican wins in CO-04 consistently surpass the 11-point threshold. The district's electoral outcomes are not always above this specific margin. For instance, in the 2004 election, Republican nominee Marilyn Musgrave won by a smaller margin of 6.3 points, receiving 51.0% of the vote against 44.8% [^][^]. This illustrates that while significant Republican margins are achievable in CO-04, their magnitude can depend on specific factors such as wave elections or the relative strength of the opposition [^][^].
6. How Did Lauren Boebert's 2024 General Election Margin Compare to Greg Lopez's in the Special Election, and What Does This Imply for 2026?
| Boebert 2024 General Election Margin | 11.6 percentage points [^][^] |
|---|---|
| Lopez 2024 Special Election Margin | Approximately 24.0 points [^][^] |
| Difference in Election Competitiveness | Lopez's margin was 12.4 points larger than Boebert's [^][^] |
Boebert's general election victory margin was significantly narrower than Lopez's special election win. Lauren Boebert secured the Colorado's 4th Congressional District general election on November 5, 2024, winning with an 11.6 percentage point margin. She received 53.6% of the vote against Trisha Calvarese's 42.0% [^][^]. In contrast, Greg Lopez won the CO-4 special election on June 25, 2024, with a substantially larger margin of approximately 24.0 points, garnering 58.40% compared to Calvarese's 34.43% [^].
The special election proved substantially less competitive than the general election. Lopez's approximate 24.0-point margin was about 12.4 points larger than Boebert's 11.6-point margin, clearly indicating that the special election outcome was less competitive than the 2024 general election [^][^]. This comparison suggests that if the 2026 election reflects the competitiveness of the 2024 general cycle, the realized margin could be closer to the 2024 general election result than to the special election outcome [^][^][^].
7. Which National Political Factors by Fall 2026 Could Most Plausibly Shift the Final Margin in a District with an R+9 PVI?
| Generic Congressional Ballot Average | D +5.9 (May 7, 2026) [^] |
|---|---|
| CO-4 Cook Partisan Voting Index (PVI) | R+9 [^][^] |
| CO-04 House Election Prediction | Republicans 59% vs Democrats 38% (Polymarket) [^] |
Nationalized political shifts could significantly impact Republican-leaning districts. By Fall 2026, national political factors are the primary drivers for plausibly shifting final margins in an R+9 PVI district. A key indicator of this is the generic congressional ballot average from Silver Bulletin, which stood at D +5.9 as of May 7, 2026, marking its highest point for the cycle and signaling a more favorable national environment for Democrats [^]. This type of nationalized vote shift is a clear mechanism for narrowing margins or even flipping Republican-leaning seats. For districts like Colorado's 4th Congressional District, which is rated R+9 on the Cook Partisan Voting Index, any significant margin shift would likely stem from this broader national swing rather than purely local partisan changes [^][^].
Declining Trump approval and tariff-driven inflation could further disadvantage Republicans. Recent polling from Brookings, conducted in mid-to-late April 2026, reports President Trump’s approval around 30% for handling inflation and 38% for tariffs [^]. These sustained declines in approval are linked to worsening GOP midterm prospects. Furthermore, tariff and trade policy is identified as a critical economic flashpoint for 2026, with USPollingData emphasizing that tariff-driven inflation experienced through summer and fall could accelerate Democratic gains, thereby impacting margins in R+9 seats [^]. Current prediction-market pricing on Polymarket for the CO-04 House election shows Republicans favored at 59% versus Democrats at 38%, which is consistent with national conditions significantly influencing expected outcomes [^].
8. What Public or Internal Polling Data for the CO-04 2026 General Election Matchup Has Surfaced?
| General Election Date | November 3, 2026 (General), June 30, 2026 (Primaries) [^] |
|---|---|
| Cook Political Report Rating | Solid R [^][^] |
| Cook Partisan Voting Index | R+9 [^] |
No specific 2026 CO-04 general election matchup polls are available. As of current research, public or internal polling data detailing potential head-to-head general election matchups for Colorado's 4th Congressional District in 2026 has not been released [^]. While a placeholder for live election results and polling data exists, specific matchup information is currently unavailable [^]. The general election is scheduled for November 3, 2026, preceded by primaries on June 30, 2026 [^]. The district itself carries a "Solid R" rating from the Cook Political Report and boasts a Cook Partisan Voting Index of R+9, signifying a strong Republican leaning [^][^][^].
Internal polling for other Colorado races exists, as do prediction markets. Despite the absence of specific CO-04 general election matchup polls, some internal polling data has surfaced for other Colorado races in 2026, including for Colorado's 5th Congressional District and various statewide issues [^][^][^]. However, these polls do not focus on potential CO-04 general election matchups. Furthermore, prediction market platforms such as Kalshi have established markets related to Colorado's 4th District, which cover aspects like the margin of victory and the eventual winner of the race [^][^].
9. How Does Lauren Boebert's Fundraising Trajectory Compare to Leading Democratic Challenger Eileen Laubacher's for the 2026 Cycle?
| Laubacher Total Fundraising | nearly $8.5 million (since May 2025) [^][^][^] |
|---|---|
| Laubacher Q1 2026 Fundraising | over $2.1 million [^][^][^][^] |
| Boebert Q1 2026 Fundraising | $90,000 [^][^] |
Democratic challenger Eileen Laubacher has accumulated substantial campaign funds for the 2026 cycle. Since announcing her candidacy in May 2025, Laubacher has raised nearly $8.5 million [^][^][^]. Her fundraising for the first quarter of 2026 alone surpassed $2.1 million, leaving her with over $3 million cash on hand [^][^][^][^]. This significant financial backing is supported by more than 390,000 donations, averaging $21.49, indicating widespread grassroots support [^][^]. As the sole Democratic candidate on the primary ballot, Laubacher can concentrate her efforts on the general election [^][^].
Conversely, Lauren Boebert's fundraising has considerably underperformed her challenger. For the first quarter of 2026, Boebert raised only $90,000, concluding the period with $160,000 cash on hand, making her the weakest fundraiser among Colorado congressional incumbents [^][^]. Her total fundraising for the 2026 cycle, since winning her most recent term, is just under $725,000 [^]. Across the race, Democrats have outspent Republicans by an estimated $10.17 million over the past two years [^].
10. What Could Change the Odds
Key Catalysts
One significant catalyst for the 2026 CO-04 race involves Democrat Trisha Calvarese seeking a rematch against Republican Lauren Boebert. Colorado Politics reported on May 6, 2025, that Calvarese sought this rematch, citing Boebert's underperformance compared to Trump in nearly every precinct and highlighting a Democratic advantage among the same voters [^]. This dynamic is presented as a potential factor for a more competitive race, especially given that Calvarese trailed Boebert by 11.6 percentage points on election night in 2024 [^].
Another key catalyst is the independent bid launched by Tim Veldhuizen in Jan 2026 [^] . Boebert in CD4">[^]. Veldhuizen noted the ballot-access signature requirement of 1,500 valid signatures in a petition window beginning in March [^]. An unaffiliated candidate effort like this could siphon votes and potentially alter the two-party margin dynamics in the general election, which is scheduled for Nov 3, 2026 [^][^]. The primary election for the district is set for June 30, 2026 [^].
Key Dates & Catalysts
- Expiration: November 03, 2027
- Closes: November 03, 2027
11. Decision-Flipping Events
- Trigger: One significant catalyst for the 2026 CO-04 race involves Democrat Trisha Calvarese seeking a rematch against Republican Lauren Boebert.
- Trigger: Colorado Politics reported on May 6, 2025, that Calvarese sought this rematch, citing Boebert's underperformance compared to Trump in nearly every precinct and highlighting a Democratic advantage among the same voters [^] .
- Trigger: This dynamic is presented as a potential factor for a more competitive race, especially given that Calvarese trailed Boebert by 11.6 percentage points on election night in 2024 [^] .
- Trigger: Another key catalyst is the independent bid launched by Tim Veldhuizen in Jan 2026 [^] .
13. Historical Resolutions
No historical resolution data available for this series.
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