Short Answer

The Republican party is not expected to win the IN-09 House seat in 2028; the market prices this outcome at 39.0%, while the model projects an 81.0% probability.

1. Market Behavior & Drivers

The primary price movement in the 2028 IN-09 House winner market, an 8.0 percentage point spike for the Democratic contract on November 08, 2026, does not have a specific reported driver. This shift increased the implied Democratic probability from 3.0% to 11.0% and corresponded with a 7.9-point drop in the price of the Republican contract. Sample data indicates this repricing occurred on zero traded volume, suggesting a shift in standing orders rather than a conviction trade based on new information.
Despite this adjustment, the market continues to price a Republican victory as the dominant probability. The Republican contract is priced at 89%, with the Democratic contract at 11%. Total trading volume is low at $7,823, indicating limited market participation and liquidity for this long-dated contract.
  • Republican victory remains likely, underpinned by the district's R+15 Cook PVI. Incumbent Rep. Houchin's 2026 reelection and fundraising reinforce the Republican lean. * Houchin's potential 2028 statewide bid may create an open seat.

Who Wins and Why

Outcome Market Model Why
Democratic party 11.0% 19.0% Rep. Houchin's 2026 victory margin was narrower, and she may not seek reelection to the House.
Republican party 39.0% 81.0% IN-09 is a reliably Republican district with an R+15 Cook PVI and Rep. Houchin won reelection in 2026.

Current Context

Prediction markets project a strong Republican lead for IN-09. Kalshi's IN-09 House winner (2028) market prices the Republican party at 89% and the Democratic party at 11% [1][2][3]. The Republican share has declined by 7.9 points from 96.9% since the last update, with the Democratic share rising by 7.9 points [1][2]. The market has recorded $7,823 in trading volume, with a maximum payout date of November 7, 2029 [1][2][3]. The 2028 IN-09 general election is scheduled for November 7, 2028; Ballotpedia does not yet list official candidates for the race [4].
IN-09 consistently performs as a reliably Republican district. Erin Houchin (R) secured reelection in the 2026 general election on November 3, 2026, with 54.1% (120,835 votes) to Brad Meyer's (D) 43.4% (96,890 votes), a 7.3-point margin, according to the AP [5][6][7]. Houchin ran unopposed in the 2026 Republican primary with 51,165 votes [4][8][9]. She raised $2.2M and spent $2M in the 2026 race, compared to Meyer's $203K raised and $169K spent [10]. The district holds a Cook Partisan Voter Index of R+15 and is rated Solid or Safe Republican by major handicappers including the Cook Political Report, Decision Desk HQ, Inside Elections, and Sabato's Crystal Ball [11][10][9][12]. Geographically, IN-09 covers south-central and southeastern Indiana, encompassing multiple counties and Indiana University Bloomington [13][14][15].
Specific factors could narrow the Republican margin by 2028. While Indiana Democrats flipped the 5th Congressional District and at least 16 state House seats in the 2026 midterms, Houchin successfully defended IN-09 [16]. Prediction market analysts suggest potential drivers for a tighter 2028 race include a severe national Democratic environment, a well-funded Democratic challenger, or a Houchin-specific development such as a statewide bid [11][17]. The 2028 cycle will also feature U.S. Senate and governor's races in Indiana [16].
Sources (17)
  1. 1IN-09 House winner? (2028) Odds & Predictionskalshi.com
  2. 2IN-09 House winner? (2028) Odds | Kalshi & Polymarketpredictmarketcap.com
  3. 3House Odds & Predictions 2026 | Kalshikalshi.com
  4. 4Indiana's 9th Congressional District election, 2028 - Ballotpediaballotpedia.org
  5. 5Indiana Ninth Congressional District Election Resultsnytimes.com
  6. 6Republican Erin Houchin wins reelection to U.S. House in Indiana's 9th Congressional Districtapnews.com
  7. 7Houchin wins reelection in Indiana’s 9th Congressional District - The Republic Newstherepublic.com
  8. 8Erin Houchin - Ballotpediaballotpedia.org
  9. 9Indiana's 9th Congressional District election, 2026 (May 5 Democratic primary) - Ballotpediaballotpedia.org
  10. 102026 Indiana US House 9 General Election Forecast | DDHQvotes.decisiondeskhq.com
  11. 11Will Republicans Win the IN-09 House Race in 2026? Winner Odds | Lines.comlines.com
  12. 12Indiana's 9th Congressional District election, 2024 - Ballotpediaballotpedia.org
  13. 13Voter guide: Meet the Hoosiers running for Congressindystar.com
  14. 14ELECTED OFFICIALS AND SCHOOL BOARDin.gov
  15. 15VOTER REGISTRATION ELECTED OFFICIALS AND SCHOOL BOARDin.gov
  16. 16All INdiana Politics: Indiana Democrats make gains in...wrtv.com
  17. 17https://polymarket.copilot.markets/event/in-09-house-election-winnerpolymarket.copilot.markets

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Significant Price Movements

Notable price changes detected in the chart, along with research into what caused each movement.

📉 November 08, 2026: 56.9pp drop

Price decreased from 95.9% to 39.0%

Outcome: Republican party

What happened: The provided web research does not identify a primary driver for a 56.9 percentage point drop in the "Republican party" outcome for the IN-09 House winner in 2028 on November 08, 2026. While the IN-09 2028 market did show a 7.9-point drop for the Republican contract in a retrieved snapshot [1], the 56.9 figure appears inconsistent with both this and the actual 2026 IN-09 district election results, which saw Republican Erin Houchin win reelection around November 3, 2026 [2][3][4]. No social media activity, traditional news, or market structure factors are mentioned in the sources that would explain a drop of this specific magnitude for the 2028 market on the specified date. Therefore, social media was irrelevant as a primary driver, as no contributing factors from any category are evident for a movement of this magnitude and timing based on the provided information.
Sources (4)
  1. 1IN-09 House winner? (2028) Odds & Predictionskalshi.com
  2. 2Republican Erin Houchin wins reelection to U.S. House in Indiana's 9th Congressional Districtapnews.com
  3. 3Indiana Ninth Congressional District Election Resultsnytimes.com
  4. 4IN-09 House election results 2026 — Call the Mapcallthemap.com

4. Market Data

Contract Snapshot

This Kalshi market predicts the winning party for the IN-09 U.S. House of Representatives election in 2028. A 'YES' contract for a specific party resolves as true if that party's candidate officially wins the election for Indiana's 9th congressional district, while a 'NO' contract resolves as true if that party's candidate does not win. The election date is around November 7, 2028, with a maximum payout date of November 7, 2029.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Republican party $0.87 $0.21 39%
Democratic party $0.12 $0.90 11%

Market Discussion

The market for the 2028 IN-09 House race currently shows the Republican Party at 89% and the Democratic Party at 11%, reflecting a 7.9-point shift toward Democrats [1]. While the district holds a Solid Republican rating (R+15 Cook Partisan Voter Index) and has not elected a Democrat since 2010, the Cook Political Report shifted the district onto the House battlefield in late October 2026, suggesting increased competitiveness concerns [2]. Future market movement could be influenced by factors such as incumbent Erin Houchin pursuing a statewide bid, a well-funded Democratic recruit, or redistricting challenges [2].

Sources (2)
  1. 1IN-09 House winner? (2028) Odds & Predictionskalshi.com
  2. 2Will Republicans Win the IN-09 House Race in 2026? Winner Odds | Lines.comlines.com

5. Trust Index

Octagon Trust Index Kalshi 70 Good

Order book is critically thin.

Primary risk· Trade quality

How it adds up
Integrity80% of score80Good
Trade quality20% of score29Avoid

Includes the cost to trade: a $1,000 order can't be filled here because the order book is too thin.

Trust score70Good

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity4 screens run · 6 don't apply

6. What political developments, such as a 2028 statewide bid by Rep. Erin Houchin, could create an open-seat scenario in IN-09?

Houchin 2026 Reelection Vote ShareRoughly 54–55% [1][2][3]
IN-09 2028 Republican Win Probability89% [4][5]
Indiana 2028 Senate Seat ClassClass 2 [6]
Representative Erin Houchin’s potential 2028 statewide bid could open her congressional seat. Houchin is specifically named among possible Republican Senate contenders for Indiana’s Class 2 U.S. Senate seat, which will be on the 2028 ballot alongside the gubernatorial election [6][7]. However, her potential bid for the Senate is not an official campaign announcement [6][8]. A gubernatorial challenge by Houchin appears less straightforward, as Governor Mike Braun was already fundraising in 2026 for an anticipated 2028 reelection campaign [9][10].
Houchin’s 2026 reelection reflected a reduced vote share amid Democratic gains. She won her third House term with roughly 54–55% of the vote in incomplete or finalizing returns [1][2][3], a decrease from her 64.5% in 2024 and 63.6% in 2022 [1][2][3]. Indiana Democrats made notable gains in 2026, including at least 15 House-seat flips, a congressional pickup, and the loss of the state House supermajority, which is expected to create a more favorable recruitment environment for 2028 [11][12][13][14]. Despite these shifts, IN-09 maintains a rating of Safe/Solid Republican [11][12][13][14], with market predictions indicating the Republican party at approximately 89% and the Democratic party at about 11% for the 2028 IN-09 House winner [4][5].
Sources (14)
  1. 1Houchin wins reelection in Indiana's 9th Congressional...therepublic.com
  2. 2Erin Houchin secures third term representing southern...wlky.com
  3. 3Houchin wins third term in Congress convincinglyipm.org
  4. 4IN-09 House winner? (2028) Odds & Predictionskalshi.com
  5. 5IN-09 House winner? (2028) Odds | Kalshi & Polymarketpredictmarketcap.com
  6. 6Indiana Politics: Elections, Candidates & Officeholders | Politics1politics1.com
  7. 7Indiana elections, 2028ballotpedia.org
  8. 8Indiana 2026: No Governor Race — Braun Just Won, But IN-5 Is Competitiveuspollingdata.com
  9. 9Braun grew reelection cash while joining others in bankrolling redistricting revenge • Indiana Capital Chronicleindianacapitalchronicle.com
  10. 10Braun grew reelection cash while joining others in bankrolling redistricting revengewthitv.com
  11. 11Indiana's 9th Congressional District election, 2026ballotpedia.org
  12. 12All INdiana Politics: Indiana Democrats make gains in...wrtv.com
  13. 13Two major Election Day developments can help improve...indianacapitalchronicle.com
  14. 14Indiana Democrats broke the Republicans' supermajority at...wfyi.org

7. How does IN-09's R+15 Cook Partisan Voter Index align with its actual presidential and congressional election results from 2020 through 2026?

IN-09 Cook PVIR+15 [1][2][3]
2024 Presidential Republican Margin29.9 points (Trump 64.1%, Harris 34.2%) [4][5]
2026 House Republican Margin10.7 points (Erin Houchin 54.1%, Brad Meyer 43.4%) [6]
Indiana's 9th Congressional District consistently voted Republican from 2020 through 2026. Indiana's 9th Congressional District (IN-09) holds a Cook Partisan Voter Index (PVI) of R+15, which has accurately identified the winning party as Republican across all observed elections from 2020 through 2026 [1][7][4][6][3]. This R+15 score is calculated using presidential election results from 2020 and 2024, with updates for any applicable boundary changes [1][2][3]. Actual Republican victory margins in both presidential and House elections between 2020 and 2024 were significantly stronger than the R+15 baseline, generally ranging from 26 to 30 points, which is approximately 11 to 15 points more Republican than the PVI indicates [7][4][6][3].
Presidential and House results consistently surpassed the PVI's Republican lean. For example, the 2020 presidential baseline showed a 27.3-point Republican margin, which increased to 29.9 points by 2024 [7][4][5]. House election results during this period also demonstrated strong Republican leads: Republicans won 60.9%–34.8% in 2020, 63.6%–33.6% in 2022, and 64.5%–32.8% in 2024 [7][4][5]. However, the 2026 House election saw a notable narrowing of this margin, with incumbent Republican Erin Houchin winning by 10.7 points (54.1% versus Democrat Brad Meyer’s 43.4%) [6]. While this outcome still resulted in a Republican victory, the sharp decrease in the winning margin to about 11 points signals meaningful downside volatility around the established baseline [6][3].
Sources (7)
  1. 12026 Cook PVI℠: District Map and Listcookpolitical.com
  2. 2The 2026 Cook Partisan Voting Index (Cook PVI℠)cookpolitical.com
  3. 3IN-09 2026cookpolitical.com
  4. 4Indiana's 9th Congressional District election, 2026ballotpedia.org
  5. 5Indiana's 9th congressional districten.wikipedia.org
  6. 6Indiana Ninth Congressional District Election Resultsnytimes.com
  7. 7Indiana's 9th Congressional District election, 2022ballotpedia.org

8. How does Rep. Houchin's 2026 fundraising compare to the financial benchmarks required for a viable Democratic challenge in 2028?

2026 Cycle-to-date Receipts$2,229,479.01 (as of September 30, 2026) [1]
2026 Cash on Hand$928,735.90 (as of October 14, 2026) [2]
2026 Receipts from Committees$1,273,931.39 [2]
Representative Houchin's 2026 campaign shows strong early fundraising momentum. Rep. Erin Houchin's campaign, Erin Houchin for Congress, has reported substantial fundraising for the 2026 election cycle. As of September 30, 2026, her cycle-to-date receipts totaled $2,229,479.01 [1]. The campaign also held $928,735.90 in cash on hand as of October 14, 2026 [2]. A significant portion of her fundraising, specifically $1,273,931.39, originated from other committees, while individual contributions accounted for $403,729.56 [2].
Specific financial benchmarks for a 2028 Democratic challenge are unavailable. The research does not provide specific financial benchmarks required for a viable Democratic challenge in the 2028 IN-09 race. However, a comparison to the 2024 IN-09 election indicates a significant fundraising disparity. In that cycle, Democratic candidate Timothy Peck reported $362,629 in receipts and $15,874 cash on hand, which was considerably less than Representative Houchin's $1,723,766 in receipts and $742,044 cash on hand [3]. The current 2028 IN-09 prediction market reflects this context, showing an approximately 11% Democratic win probability and an 89% Republican win probability [4][5].
Sources (5)
  1. 1FEC Disclosure Form 3 for HOUCHIN FOR CONGRESSdocquery.fec.gov
  2. 2HOUCHIN, ERIN - Candidate overviewfec.gov
  3. 3Indiana's 9th Congressional District election, 2024ballotpedia.org
  4. 4IN-09 House winner? (2028) Odds & Predictionskalshi.com
  5. 5IN-09 House winner? (2028) Odds | Kalshi & Polymarketpredictmarketcap.com

9. What are the key candidate filing and FEC reporting deadlines for the 2028 Indiana election cycle?

2028 Indiana General Election DateNovember 7, 2028 [1][2][3]
Expected 2028 Primary Filing DeadlineEarly February 2028 [4]
FEC Statement of Candidacy FilingWithin 15 days after becoming a candidate (raising/spending >$5,000) [5][6][7]
Indiana's 2028 general election is scheduled for early November. The statewide general election for Indiana is set for November 7, 2028 [1][2][3]. While the precise candidate filing deadline for the 2028 primary election has not yet been determined, it is anticipated to occur in early February 2028, following the pattern of the 2026 election cycle [4]. For context, Indiana's 2026 primary candidate filing deadline was February 6, 2026, in advance of the primary election held on May 5, 2026 [4][8][3].
Federal candidates face specific registration and reporting requirements. For individuals seeking federal office, the Federal Election Commission (FEC) requires a Statement of Candidacy (Form 2) to be filed within 15 days of becoming a candidate, a status achieved when more than $5,000 is raised or spent [5][6][7]. Additionally, federal candidates are mandated to submit various financial disclosures, including quarterly reports, pre-election reports, and post-general election reports [5][6][7].
Specific 2028 FEC reporting deadlines are not yet available. Although the FEC maintains a dedicated page for 2028 Indiana House District 07 election data, the provided facts do not yet specify the dates for these various reporting deadlines for the 2028 cycle [9]. Regarding specific candidacies, the official listings for Indiana's 9th Congressional District election in 2028 do not currently list any candidates [10].
Sources (10)
  1. 1Election Day: Frequently Asked Questionscongress.gov
  2. 2United States House of Representatives elections, 2028ballotpedia.org
  3. 3Indiana's 1st Congressional District election, 2028ballotpedia.org
  4. 4Filing requirements for congressional candidatesballotpedia.org
  5. 5Registering a candidatefec.gov
  6. 6House, Senate and presidential candidate registrationfec.gov
  7. 7Dates and deadlinesfec.gov
  8. 8Indiana state legislative districtsballotpedia.org
  9. 92028 Election United States House - Indiana - District 07fec.gov
  10. 10Indiana's 9th Congressional Districtballotpedia.org

10. What national political environment in 2028, as measured by the generic congressional ballot, would be necessary to shift IN-09 from 'Solid' to 'Leans Republican'?

Generic Ballot Lead for IN-09 ShiftStronger than D+8.8 to D+11 (2026 cycle) [1][2][3][4][5][6]
2026 Democratic Generic Ballot LeadD+8.8 (Nate Silver's average) [1][2][3][4][5][6]
IN-09 2026 Rating & MarginSolid Republican / R+11 win for Erin Houchin [7][8][9][1]
To shift Indiana's 9th Congressional District (IN-09) from 'Solid Republican' to 'Leans Republican' in 2028, a significant Democratic lead in 2026 was insufficient for IN-09. The national political environment would require a Democratic generic congressional ballot lead stronger than the D+8.8 to D+11 observed in the 2026 cycle [1][2][3][4][5][6]. In the 2026 midterm, Democrats led the generic congressional ballot 51.8% to 43.0% (D+8.8) according to Nate Silver's average, with individual polls indicating even larger Democratic leads [1][2][3][4][5][6]. Despite this environment, IN-09 was consistently rated as 'Solid Republican' by Cook Political Report and Inside Elections, and 'Safe Republican' by Sabato's Crystal Ball, with Erin Houchin winning the district by an R+11 margin [7][8][9][1].
IN-09's 'Solid Republican' rating persisted despite national shifts. Even as Cook Political Report moved several other Republican-held seats from 'Solid Republican' to 'Likely Republican' and from 'Likely Republican' to 'Lean Republican' under the 2026 D+8.8 generic ballot, IN-09 was not among the districts shifted [1][10]. This indicates that the D+8 to D+11 national environment observed in 2026 was insufficient to change IN-09's rating from 'Solid' to 'Leans Republican' [1]. For IN-09 to potentially shift ratings in 2028, the environment would need to be at least as favorable to Democrats as it was in 2018, when Democrats won 235 House seats [11]. While market prices for the 2028 IN-09 race suggest traders anticipate increased competitiveness, they still show Republicans as favored [12][13].
Sources (13)
  1. 12026 CPR House Race ratingscookpolitical.com
  2. 2House Odds & Predictions 2026 | Kalshikalshi.com
  3. 3Who's ahead on the generic congressional ballot?natesilver.net
  4. 4Trump approval near career low ahead of elections, Reuters/Ipsos...reuters.com
  5. 5Poll: Voters demand change and a check on Trump, fueling a steep...nbcnews.com
  6. 6Are the US midterms going to see a blue wave of Democrats winning seatstheguardian.com
  7. 7Indiana Ninth Congressional District Election Resultsnytimes.com
  8. 82026 Indiana 9th District House Forecast | Election Odds &...pollsmax.com
  9. 9Indiana's 9th Congressional District election, 2026ballotpedia.org
  10. 10Cook Political Report shifts 12 more House races toward...thehill.com
  11. 11The House: 28 Rating Changes Push Number of Seats at Least Leaning to...centerforpolitics.org
  12. 12IN-09 House winner? (2028) Odds & Predictionskalshi.com
  13. 13IN-09 House winner? (2028) Odds | Kalshi & Polymarketpredictmarketcap.com

11. What Could Change the Odds

Key Catalysts for IN-09 2028

Market probabilities for Indiana's 9th Congressional District in 2028 currently favor the Republican Party. A Kalshi contract, observed November 9, 2026, priced the Republican Party at 89% (88 de), with the Democratic Party at 11% (11 de) [1]. In contrast, a Manifold-market snapshot from November 8, 2026, indicated a Republican Party probability of 97.6%, against 1.6% for the Democratic Party and 0.8% for Other [2]. This district has a structural Republican baseline, with Erin Houchin (R) winning the 2026 election against Brad Meyer (D) with 54.1% of the vote to 43.4% [3][4]. Ratings for the 2026 cycle labeled IN-09 as Safe R or Solid R [5].
Upcoming catalysts for the 2028 election include Houchin's reelection decision, candidate recruitment and fundraising efforts, potential Indiana map changes, and the broader 2028 national House environment [6][5]. Additionally, any primary or general-election polling will influence market probabilities [6][5]. As of the cited record, no official candidates, filing deadline, primary date, incumbent, or race rating had been established for the November 7, 2028 general election [6].

Key Dates & Catalysts

  • Expiration: November 07, 2029
  • Closes: November 07, 2029
Sources (6)
  1. 1IN-09 House winner? (2028) Odds & Predictionskalshi.com
  2. 2Which party will win the 2028 U.S. House election in Indiana's 9th District? - Manifold Markets Odds | CoinRithmcoinrithm.com
  3. 3Republican Erin Houchin wins reelection to U.S. House in Indiana's 9th Congressional Districtapnews.com
  4. 4Indiana Ninth Congressional District Election Resultsnytimes.com
  5. 52026 United States House of Representatives elections in Indianaen.wikipedia.org
  6. 6Indiana's 9th Congressional District election, 2028 - Ballotpediaballotpedia.org

13. Historical Resolutions

Historical Resolutions: 20 markets in this series

Outcomes: 7 resolved YES, 13 resolved NO

Recent resolutions:

  • KXHOUSERACE-MN05-26-DJAC: NO (Nov 04, 2026)
  • KXHOUSERACE-IL04-26-CGET: NO (Nov 04, 2026)
  • KXHOUSERACE-NE01-26-AAHL: NO (Nov 04, 2026)
  • KXHOUSERACE-IL04-26-MMAC: NO (Nov 04, 2026)
  • KXHOUSERACE-CA06-26-KKIL: NO (Nov 04, 2026)