Harris Insights & Analytics

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: 182
Mean absolute error: 5.05percentage points
Historical bias: R+1.11
Represented cycles: 81998–2020
Current archive: 0canonical records
History span: Oct 20, 1998through Nov 1, 2020

Identity

Known names and relationships

Known aliases: No additional reviewed aliases
Organization type: Single canonical organization
Cycles represented: 1998 · 2000 · 2002 · 2004 · 2006 · 2008 · 2018 · 2020

182 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.

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.

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.

See this pollster in the Full Poll Archive →

Certified-result history

Eligible historical observations

32 shown · 182 total

Cycle	Race	Type	Field end	Sample	Poll	Result	Error
1998	1998_Gov-G_MA	Gov-G	1998-10-30	1,083	R+11.0	R+3.4	R+7.6
1998	1998_Gov-G_IL	Gov-G	1998-10-30	847	R+14.0	R+3.6	R+10.4
1998	1998_Gov-G_GA	Gov-G	1998-10-30	1,408	R+7.0	D+8.4	R+15.4
1998	1998_Gov-G_FL	Gov-G	1998-10-30	2,819	R+17.0	R+10.6	R+6.5
1998	1998_Gov-G_CA	Gov-G	1998-10-30	5,735	D+11.0	D+19.6	R+8.6
1998	1998_Gov-G_AZ	Gov-G	1998-10-30	850	R+17.0	R+25.4	D+8.4
1998	1998_Sen-G_WA	Sen-G	1998-10-20	831	D+13.0	D+16.8	R+3.8
1998	1998_Sen-G_PA	Sen-G	1998-10-20	1,611	R+32.0	R+26.6	R+5.5
1998	1998_Sen-G_OH	Sen-G	1998-10-20	1,793	R+18.0	R+12.9	R+5.1
1998	1998_Sen-G_NY	Sen-G	1998-10-20	1,792	R+2.0	D+10.5	R+12.5
1998	1998_Sen-G_NC	Sen-G	1998-10-20	1,163	D+9.0	D+4.1	D+4.9
1998	1998_Sen-G_MD	Sen-G	1998-10-20	911	D+40.0	D+41.0	R+1.0
1998	1998_Sen-G_IN	Sen-G	1998-10-20	831	D+36.0	D+28.9	D+7.1
1998	1998_Sen-G_IL	Sen-G	1998-10-20	1,209	R+14.0	R+2.9	R+11.1
1998	1998_Sen-G_GA	Sen-G	1998-10-20	1,174	R+16.0	R+7.2	R+8.8
1998	1998_Sen-G_FL	Sen-G	1998-10-20	2,295	D+29.0	D+24.9	D+4.1
1998	1998_Sen-G_CO	Sen-G	1998-10-20	614	R+18.0	R+27.5	D+9.5
1998	1998_Sen-G_CA	Sen-G	1998-10-20	4,531	D+1.0	D+10.1	R+9.1
1998	1998_Sen-G_AZ	Sen-G	1998-10-20	732	R+48.0	R+41.6	R+6.4
1998	1998_Gov-G_TX	Gov-G	1998-10-20	3,248	R+51.0	R+37.1	R+13.9
1998	1998_Gov-G_PA	Gov-G	1998-10-20	1,611	R+48.0	R+26.4	R+21.6
1998	1998_Gov-G_OH	Gov-G	1998-10-20	1,793	R+11.0	R+5.4	R+5.6
1998	1998_Gov-G_NY	Gov-G	1998-10-20	1,792	R+24.0	R+21.1	R+2.9
1998	1998_Gov-G_MI	Gov-G	1998-10-20	1,535	R+15.0	R+24.4	D+9.4
1998	1998_Gov-G_MD	Gov-G	1998-10-20	911	R+13.0	D+10.3	R+23.3
1998	1998_Gov-G_MA	Gov-G	1998-10-20	907	R+20.0	R+3.4	R+16.6
1998	1998_Gov-G_IL	Gov-G	1998-10-20	1,209	R+18.0	R+3.6	R+14.4
1998	1998_Gov-G_GA	Gov-G	1998-10-20	1,174	R+5.0	D+8.4	R+13.4
1998	1998_Gov-G_FL	Gov-G	1998-10-20	2,295	R+16.0	R+10.6	R+5.5
1998	1998_Gov-G_CO	Gov-G	1998-10-20	614	D+3.0	R+0.6	D+3.6
1998	1998_Gov-G_CA	Gov-G	1998-10-20	4,531	D+11.0	D+19.6	R+8.6
1998	1998_Gov-G_AZ	Gov-G	1998-10-20	732	R+20.0	R+25.4	D+5.4

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.