DHM Research
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
- 12
- Mean absolute error
- 2.54percentage points
- Historical bias
- R+0.19
- Represented cycles
- 82000–2016
- Current archive
- 0canonical records
- History span
- Oct 27, 2000through Oct 27, 2016
Known names and relationships
- Known aliases
- No additional reviewed aliases
- Organization type
- Single canonical organization
- Cycles represented
- 2000 · 2002 · 2004 · 2006 · 2008 · 2010 · 2012 · 2016
12 eligible historical polls across 8 represented cycles passed the published history identity checks. Historical bias is descriptive and is kept separate from sponsor or client affiliation.
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.
0 shown · 0 total
No record in the currently authorized canonical archive is attached to this identity.
This is not evidence that the pollster released no 2026 polling; the source-audit gaps remain documented.
Eligible historical observations
12 shown · 12 total
| Cycle | Race | Type | Field end | Sample | Poll | Result | Error |
|---|---|---|---|---|---|---|---|
| 2016 | 2016_Pres-G_OR | Pres-G | 2016-10-27 | 504 | D+7.0 | D+11.4 | R+4.4 |
| 2016 | 2016_Gov-GS_OR | Gov-G | 2016-10-27 | 504 | D+9.0 | D+7.2 | D+1.8 |
| 2012 | 2012_Pres-G_OR | Pres-G | 2012-10-27 | 500 | D+7.0 | D+12.2 | R+5.2 |
| 2010 | 2010_Gov-G_OR | Gov-G | 2010-10-28 | 1,000 | D+3.0 | D+1.5 | D+1.5 |
| 2010 | 2010_Gov-G_OR | Gov-G | 2010-10-25 | 500 | R+3.0 | D+1.5 | R+4.5 |
| 2008 | 2008_Sen-G_OR | Sen-G | 2008-10-24 | 500 | D+5.0 | D+3.4 | D+1.6 |
| 2008 | 2008_Pres-G_OR | Pres-G | 2008-10-24 | 500 | D+19.0 | D+16.5 | D+2.5 |
| 2006 | 2006_Gov-G_OR | Gov-G | 2006-10-30 | 600 | D+7.0 | D+8.0 | R+1.0 |
| 2004 | 2004_Pres-G_OR | Pres-G | 2004-10-26 | 608 | D+6.0 | D+4.2 | D+1.8 |
| 2002 | 2002_Sen-G_OR | Sen-G | 2002-10-27 | 608 | R+19.0 | R+16.6 | R+2.4 |
| 2002 | 2002_Gov-G_OR | Gov-G | 2002-10-27 | 608 | D+6.0 | D+2.9 | D+3.1 |
| 2000 | 2000_Pres-G_OR | Pres-G | 2000-10-27 | 600 | D+1.0 | D+0.4 | D+0.6 |
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.