15% — Will Donald J. Trump be the nominee for the Presidency for the Republican party
Kalshi 15% · 5 contracts · $56K volume · medium confidence
Updated 2026-09-08 15:19:04 UTC

Why this matters:
This probability indicates the market's assessment that Trump has a 15% chance of becoming the Republican presidential nominee. As of August 2026, this relatively low probability reflects market perception that other candidates are viewed as more likely to secure the nomination. The current level would move based on Trump's standing in primary polls, his legal situation, and endorsements from party establishment figures. The Republican National Convention in 2028 represents the key event that will definitively resolve this outcome, though primary elections and early state contests beginning in late 2027 will provide significant clarity on the trajectory of the nomination race.

Key factors:
- Trump's standing in early Republican primary polling relative to leading alternatives like Vance (43¢), Rubio (22¢), and DeSantis (5¢)
- Status of ongoing legal proceedings and their potential impact on his eligibility or political viability
- Support from Republican establishment figures and current party leadership direction
- Performance in early primary contests scheduled for late 2027 and early 2028
- Turnout and vote share trends in states that hold the earliest nominating contests

Contracts:
- Will Marco Rubio be the nominee for the Presidency for the Republican party?: Marco Rubio — 20¢ Kalshi $36K (weight 65%)
- Will Ron DeSantis be the nominee for the Presidency for the Republican party?: Ron DeSantis — 4¢ Kalshi $13K (weight 24%)
- Will J.D. Vance be the nominee for the Presidency for the Republican party?: J.D. Vance — 45¢ Kalshi $3K (weight 6%)
- Will Tucker Carlson be the nominee for the Presidency for the Republican party?: Tucker Carlson — 3¢ Kalshi $2K (weight 4%)
- Will Donald J. Trump Jr. be the nominee for the Presidency for the Republican party?: Donald J. Trump Jr. — 3¢ Kalshi $7 (weight 0%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-09-08T14:20:49.766Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "15% per prediction markets (SimpleFunctions, September 2026)"
Canonical: https://simplefunctions.dev/answer/presnomr
Full data: https://simplefunctions.dev/api/public/query?q=Will%20Donald%20J.%20Trump%20be%20the%20nominee%20for%20the%20Presidency%20for%20the%20Republican%20party
Provider: SimpleFunctions — https://simplefunctions.dev