Potomac Incorporated
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
- 6
- Mean absolute error
- 3.27percentage points
- Historical bias
- R+1.05
- Represented cycles
- 31998–2006
- Current archive
- 0canonical records
- History span
- Oct 24, 1998through Oct 29, 2006
Known names and relationships
- Known aliases
- No additional reviewed aliases
- Organization type
- Single canonical organization
- Cycles represented
- 1998 · 2002 · 2006
6 eligible historical polls is a limited denominator; both MAE and bias may move materially as another cycle is added.
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
6 shown · 6 total
| Cycle | Race | Type | Field end | Sample | Poll | Result | Error |
|---|---|---|---|---|---|---|---|
| 2006 | 2006_Sen-G_MD | Sen-G | 2006-10-29 | 800 | D+6.0 | D+10.0 | R+4.0 |
| 2006 | 2006_Gov-G_MD | Gov-G | 2006-10-29 | 800 | D+1.0 | D+6.5 | R+5.5 |
| 2002 | 2002_House-G_MD-8 | House-G | 2002-10-27 | 563 | R+3.0 | D+4.2 | R+7.2 |
| 2002 | 2002_House-G_MD-2 | House-G | 2002-10-27 | 478 | D+9.0 | D+8.6 | D+0.4 |
| 2002 | 2002_Gov-G_MD | Gov-G | 2002-10-27 | 869 | R+4.0 | R+3.9 | R+0.1 |
| 1998 | 1998_Gov-G_MD | Gov-G | 1998-10-24 | 1,205 | D+8.0 | D+10.3 | R+2.3 |
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.