Kalshi
2028 Iowa Republican caucus winner?
IA
As of October 5, 2026, traders on Kalshi favor J.D. Vance at 41%, ahead of Marco Rubio at 31%. $0 traded in the last 24 hours, $18 in all.
- Favorite
- J.D. Vance 41%
- 24 hours
- no change
- Traded today
- $0
- Traded in all
- $18
- Closes
- November 7, 2028
Every outcome (top 6 of 10)
- J.D. Vance41%
- Marco Rubio31%
- Donald J. Trump Jr.4%
- Donald J. Trump4%
- Tucker Carlson4%
- Thomas Massie4%
4 more outcomes, mostly long shots, are listed on Kalshi.
How the odds have moved
0%25%50%75%100%2:50 AM2:50 PM2:50 AM41% J.D. Vance
The line follows the current favorite, J.D. Vance. One reading an hour.
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- 2028 Republican Presidential ticketJD Vance and Marco Rubio 40%
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Prices are Kalshi's own (bid/ask midpoint), collected every 10 minutes. Research, not betting advice.
