# Will Josh Shapiro and JD Vance be the 2028 Democratic and Republican presidential nominees

> Liquidity-weighted aggregate at 6% across 8 contracts — refreshed 26 min ago.

URL: https://simplefunctions.dev/odds/presmatchup
Updated: 2026-06-26T07:20:51.147Z
Category: politics · Topic: election-2026
Status: active
Closes: 2028-11-07

## Headline

- Probability: 6% (liquidity-weighted across 8 contracts)
- Venue: Kalshi (8 contracts)
- 24h volume: $31

## Bound contracts (8)

| Outcome | Price | 24h | Volume | Venue | Slug |
|---|---|---|---|---|---|
| Gavin Newsom v. Marco Rubio | 13¢ | −1pp | $31 | kalshi | /markets/will-gavin-newsom-and-marco-rubio-be-the-2028-demo-kalshi-kxpresmatchup-28nov07-gnewmrub |
| AOC v. JD Vance | 4¢ | +2pp | $0 | kalshi | /markets/will-alexandria-ocasio-cortez-and-jd-vance-be-the-kalshi-kxpresmatchup-28nov07-aocjvan |
| AOC v. Marco Rubio | 4¢ | +2pp | $0 | kalshi | /markets/will-alexandria-ocasio-cortez-and-marco-rubio-be-t-kalshi-kxpresmatchup-28nov07-aocmrub |
| Gavin Newsom v. JD Vance | 12¢ | +1pp | $0 | kalshi | /markets/will-gavin-newsom-and-jd-vance-be-the-2028-democra-kalshi-kxpresmatchup-28nov07-gnewjvan |
| Jon Ossoff v. JD Vance | 4¢ | +2pp | $0 | kalshi | /markets/will-jon-ossoff-and-jd-vance-be-the-2028-democrati-kalshi-kxpresmatchup-28nov07-jossjvan |
| Jon Ossoff v. Marco Rubio | 4¢ | +1pp | $0 | kalshi | /markets/will-jon-ossoff-and-marco-rubio-be-the-2028-democr-kalshi-kxpresmatchup-28nov07-jossmrub |
| Kamala Harris v. JD Vance | 5¢ | −1pp | $0 | kalshi | /markets/will-kamala-harris-and-jd-vance-be-the-2028-democr-kalshi-kxpresmatchup-28nov07-kharjvan |
| Kamala Harris v. Marco Rubio | 3¢ | — | $0 | kalshi | /markets/will-kamala-harris-and-marco-rubio-be-the-2028-dem-kalshi-kxpresmatchup-28nov07-kharmrub |

## 30-day trajectory

| Day | Aggregate |
|---|---|
| 2026-05-27 | 8 |
| 2026-06-12 | 10 |
| 2026-06-19 | 12 |
| 2026-06-25 | 13 |

_19 days of price history captured. Each row is the daily mean of intraday 5-min captures._

## Analysis

This probability reflects the combined chances that both Josh Shapiro becomes the Democratic nominee and JD Vance becomes the Republican nominee for the 2028 presidential election. At 7%, the market suggests this pairing is possible but unlikely. Shapiro faces competition from other Democratic contenders like Gavin Newsom and Jon Ossoff, whose head-to-head matchups against Vance trade at higher probabilities (14% and 3% respectively). The low probability reflects uncertainty about whether Shapiro can consolidate Democratic support while Vance secures the Republican nomination. The primary election season beginning in early 2028 will be the critical event determining these outcomes, though candidate positioning, endorsements, and early state contests throughout 2026-2027 will provide important signals about their viability.

### Key factors

- Shapiro's current polling position relative to other Democratic candidates and his electoral performance in upcoming Democratic contests
- Vance's status as current Vice President and his support among Republican primary voters compared to potential challengers
- Early state primary results and endorsement patterns from key political figures in 2026-2027 that signal momentum
- Major economic, geopolitical, or political events between now and 2028 that could substantially alter candidate viability or voter preferences
- The competitive dynamics within each party, including whether other candidates consolidate support or fragment the field

## Methodology

Probability is **liquidity-weighted** across all bound Kalshi/Polymarket contracts: Σ(price × volume) ÷ Σ(volume). 30-day trajectory uses the daily mean of intraday 5-min captures. 24h delta = today's mean − yesterday's mean. Movement events are ≥3pp daily moves in the last 7 days.

## How to use this data

- HTML: https://simplefunctions.dev/odds/presmatchup
- JSON: https://simplefunctions.dev/api/public/odds?slug=presmatchup
- Topic hub: https://simplefunctions.dev/predictions/election-2026

## License

CC-BY-4.0. Attribute "SimpleFunctions" with a link to https://simplefunctions.dev. See https://simplefunctions.dev/legal for terms.