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Pollster file

Harper Polling

Historical accuracy is measured against certified results. Current-cycle records come from the canonical, deduplicated archive and do not by themselves change the sealed forecast.

Historical polls
11
Mean absolute error
2.90percentage points
Historical bias
D+0.71
Represented cycles
52013–2020
Current archive
20canonical records
History span
Jun 11, 2013through Oct 24, 2020
Identity

Known names and relationships

Known aliases
Harper Polling (R)
Organization type
Single canonical organization
Cycles represented
2013 · 2014 · 2015 · 2016 · 2020

11 eligible historical polls across 5 represented cycles passed the published history identity checks. Historical bias is descriptive and is kept separate from sponsor or client affiliation.

Canonical 2025–2026 archive

Current-cycle records

Archive source date 2026-09-09 · bundled copy. Archive records may be newer than the sealed forecast; inclusion here does not mean the forecast uses them.

8 shown · 20 total

Cooper +12.5

Roy Cooper 51.5% · Michael Whatley 39%

Field dates
Aug 9–Aug 10, 2026
Sample
600 LV
Sponsor / client
The Carolina Journal
Partisan sponsorship
No partisan sponsorship flag
Cooper +11.1

Roy Cooper 49.8% · Michael Whatley 38.7%

Field dates
May 10–May 11, 2026
Sample
600 LV
Sponsor / client
Carolina Journal
Partisan sponsorship
No partisan sponsorship flag
Cooper +7.8

Roy Cooper 48.9% · Michael Whatley 41.1%

Field dates
Mar 22–Mar 23, 2026
Sample
600 LV
Sponsor / client
Carolina Journal
Partisan sponsorship
No partisan sponsorship flag
Cooper +8

Roy Cooper 47% · Michael Whatley 39%

Field dates
Nov 9–Nov 10, 2025
Sample
600 LV
Sponsor / client
Carolina Journal
Partisan sponsorship
No partisan sponsorship flag
Cooper +10.1

Roy Cooper 48.1% · Don Brown 38%

Field dates
Nov 9–Nov 10, 2025
Sample
600 LV
Sponsor / client
Carolina Journal
Partisan sponsorship
No partisan sponsorship flag
Cooper +4

Roy Cooper 46% · Michael Whatley 42%

Field dates
Sep 14–Sep 15, 2025
Sample
600 LV
Sponsor / client
Carolina Journal
Partisan sponsorship
No partisan sponsorship flag
Cooper +8.2

Roy Cooper 47.3% · Michael Whatley 39.1%

Field dates
Aug 11–Aug 12, 2025
Sample
600 LV
Sponsor / client
Carolina Journal
Partisan sponsorship
No partisan sponsorship flag
See this pollster in the Full Poll Archive →
Certified-result history

Eligible historical observations

11 shown · 11 total

CycleRaceTypeField endSamplePollResultError
20202020_Sen-G_NCSen-G2020-10-24504D+3.0R+1.8D+4.8
20202020_Pres-G_NCPres-G2020-10-24504D+1.0R+1.4D+2.4
20202020_Gov-G_NCGov-G2020-10-24504D+10.0D+4.5D+5.5
20162016_Sen-G_PASen-G2016-11-035040R+1.4D+1.4
20162016_Pres-G_PAPres-G2016-11-035040R+0.7D+0.7
20152015_Gov-O_LAGov-G2015-10-17612D+10.0D+16.9R+6.9
20142014_Sen-G_NCSen-G2014-10-29511R+2.5R+1.6R+0.9
20142014_House-G_NY-21House-G2014-10-28560R+14.0R+21.3D+7.3
20142014_Gov-G_PAGov-G2014-10-27680D+10.0D+9.9D+0.1
20132013_Sen-GS_NJSen-G2013-10-14778D+11.0D+10.9D+0.1
20132013_Sen-GS_MASen-G2013-06-11498D+12.0D+10.2D+1.8

1 further row is held in this pollster’s history shard as within-party or nonpartisan contests (Prim). Those carry no D/R orientation, so they are excluded from the error, bias and coverage figures above and from the table.

Method · historical final-three-week D/R general-election rows plus verified historical supplement; min n=5

Definition · bias_D is poll D-R margin minus actual D-R margin; positive overstates Democrats.

A missing sample, sponsor or source is labeled unavailable; it is never reconstructed.

Poll data via VoteHub, used under CC BY 4.0. Poll data from The New York Times, used under CC BY 4.0.