Mason-Dixon poll
Fielded 10/12/2026 – 10/14/2026 · 500 respondents · Likely voters
Result
Share of respondents (remainder shown as undecided / other)
Marty Jackley (R)
60%
Nikki Gronli (D)
32%
About this poll
- Pollster
- Mason-Dixon
- Field dates
- Monday, October 12, 2026 – Wednesday, October 14, 2026
- Sample
- 500 · Likely voters
- Sponsors
- South Dakota News Watch, Chiesman Center for Democracy at the University of South Dakota
- Internal poll
- No
- Published
- Wednesday, October 21, 2026
- Source
- www.sdnewswatch.org (opens in a new tab)
- Data feed
- VoteHub
- Last updated