Who was asked matters.
LV means likely voters; RV means registered voters. Those groups differ. Pollsters also use different turnout screens, weighting, and interview modes, so movement between surveys may reflect methodology.
THE POLLING TRACKER
The race, survey by survey.
Ten public polls of the Sand–Lahn matchup, with original sources and clear notes on what each survey measures.
Researched September 28, 2026 · Latest dated release found: September 22 · This is a dated snapshot, not a live feed.
Latest survey in this snapshot
Marist University
1,050 registered voters · Sep 17–20
Released September 22
Rob Sand · D54%
Zach Lahn · R42%
Reported margin of error±4.4
percentage points
Reported support over time
Individual survey results · share of respondents
● Rob Sand (D)■ Zach Lahn (R)
No polls match these filters. Try a wider date range or reset the filters.
Lines connect separate surveys with different samples and methods. They are not a polling average or forecast. Uncertainty is listed for every poll below.
Marist University · Sep 17–20, 2026
Sand 54% · Lahn 42% · 1,050 registered voters · Reported margin of error ±4.4 percentage points.
Hover, tap, or focus a chart point to see its details. Only filtered polls with verified field dates appear in the graph; the Siena release remains in the table because its field dates could not be independently confirmed. Wedgewood data is verified through secondary sources only. co/efficient has verified field dates but no verified release day; it is excluded when either release-date filter is set.
Filtered poll releases
Recent reports · all dates in 2026; co/efficient’s release day is unverified
| Pollster / sponsor | Field dates | Sample | Sand · D | Lahn · R | Uncertainty | Source & review notes |
|---|---|---|---|---|---|---|
| Marist UniversityReleased Sep 22, 2026 | Sep 17–20 | 1,050 RV | 54% | 42% | ±4.4 ppMargin of error | Original report ↗Original release checked September 28. Registered voters; live phone interviews, text, and online. This is one survey, not an average or a forecast. |
| co/efficientReleased September 2026 · exact day unverified | Sep 14–16 | 831 LV | 46% | 42% | ±3.39 ppMargin of error | Original report ↗Original governor question and methods checked September 28; 12% undecided. Mobile text responses and landline interviews. Firm describes this as independent public polling with no candidate, party, or independent-expenditure sponsor. Original page gives September only for release; excluded when release-date filters are set. |
| Cygnal / ITR FoundationReleased Sep 15, 2026 | Sep 9–11 | 500 LV | 47.8% | 44.4% | ±4.38 ppMargin of error | Original report ↗Original toplines checked. Sponsored by Iowans for Tax Relief Foundation; 7.8% undecided. |
| YouGovReleased Sep 11, 2026 | Sep 3–8 | 2,169 RV | 50% | 39% | ±3.5 ppMargin of error | Original report ↗Original toplines checked. Full registered-voter sample shown; likely-voter subsets are not counted as separate polls. |
| Emerson College / NexstarReleased Sep 3, 2026 | Aug 31–Sep 1 | 750 LV | 49% | 46% | ±3.6 ppCredibility interval | Original report ↗Original release checked. Text-to-web and online panel; Nexstar sponsored. Uses rounded press-release results. |
| Wedgewood PollsReleased Aug 30, 2026 | Aug 27–29 | 600 LV | 51% | 46% | ±4.6 ppReported margin of error | Original report ↗ · Secondary source ↗Secondary-source verification only: 270toWin and PB Polls. Original PDF was not readable during review; method not independently verified. |
| Suffolk UniversityReleased Aug 26, 2026 | Aug 20–23 | 500 LV | 47.8% | 43.6% | ±4.4 ppMargin of error | Original report ↗Original toplines checked. Margin of error cross-checked with 270toWin; 7.8% undecided and 0.8% refused. |
| Emerson College / NexstarReleased Aug 6, 2026 | Aug 2–4 | 712 LV | 48% | 43% | ±3.7 ppCredibility interval | Original report ↗Original release checked. Text-to-web and online panel; Nexstar sponsored. Uses rounded press-release results. |
| Fox NewsReleased Jul 1, 2026 | Jun 23–27 | 1,003 RV | 53% | 44% | ±3 ppMargin of error | Original report ↗Original toplines checked. Beacon Research and Shaw & Company Research; live phone interviews and text-to-web. |
| New York Times / SienaReleased Jul 1, 2026 | Not independently verified | 600 LV | 48% | 47% | ±5 ppReported margin of error | Original report ↗ · Secondary source ↗Results, sample, release date, and uncertainty from 270toWin. Original report inaccessible during review. Omitted from the date-based chart because field dates could not be confirmed. |
Allow for uncertainty.
Reported margins of error and credibility intervals describe a survey’s uncertainty; they are not the margin of error for the difference between candidates. Sampling uncertainty is only one possible source of polling error.
Read the original context.
Figures retain each source’s published precision. Undecided and other responses are not redistributed. Rounded percentages may not total 100%. Emerson reports a credibility interval, distinguished in the table.
Selection: ten public reports for the Sand–Lahn matchup, retaining the eight reports in the September 17 edition and adding Marist ↗ and co/efficient ↗ after checking their original reports on September 28. Discovery included 270toWin and Call the Map. Wedgewood and Siena retain the source limitations noted above. Different voter subsets from the same survey are not counted separately. Primary polls and other candidate matchups are excluded. No average, forecast, or win probability is calculated.
Next: make your voting plan →