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.
698 eligible historical polls across 22 represented cycles passed the published history identity checks. Historical bias is descriptive and is kept separate from sponsor or client affiliation.
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.
12 shown · 37 total
Amy Klobuchar 52% · Lisa Demuth 36% · Steven Young 1%
Peggy Flanagan 46% · Michele Tafoya 41% · Marisa Simonetti 1% · Rebecca Whiting 1%
Anthony Constantino 39% · Blake Gendebien 43% · Chris Schmidt 5%
Amy Klobuchar 49% · Kendall Qualls 33%
Amy Klobuchar 49% · Patrick Knight 33%
Amy Klobuchar 48% · Kristin Robbins 33%
Amy Klobuchar 49% · Lisa Demuth 34%
Amy Klobuchar 49% · Brad Kohler 32%
Amy Klobuchar 52% · Mike Lindell 32%
Amy Klobuchar 49% · Phil Parrish 32%
Mikie Sherrill 51% · Jack Ciattarelli 38%
Ed Markey 45% · John Deaton 26%
50 shown · 698 total
| Cycle | Race | Type | Field end | Sample | Poll | Result | Error |
|---|---|---|---|---|---|---|---|
| 2010 | 2010_House-G_KY-3 | House-G | 2010-10-23 | 588 | D+4.0 | D+10.7 | R+6.7 |
| 2010 | 2010_House-G_IN-3 | House-G | 2010-10-23 | 400 | R+25.0 | R+29.6 | D+4.7 |
| 2010 | 2010_House-G_CA-20 | House-G | 2010-10-23 | 601 | R+10.0 | D+3.4 | R+13.4 |
| 2010 | 2010_Gov-G_GA | Gov-G | 2010-10-23 | 601 | R+10.0 | R+10.1 | D+0.1 |
| 2010 | 2010_Gov-G_CA | Gov-G | 2010-10-23 | 594 | D+8.0 | D+12.9 | R+4.9 |
| 2010 | 2010_Sen-G_CO | Sen-G | 2010-10-20 | 621 | 0 | D+1.6 | R+1.6 |
| 2010 | 2010_House-G_WA-2 | House-G | 2010-10-20 | 643 | D+4.0 | D+2.1 | D+1.9 |
| 2010 | 2010_House-G_WA-8 | House-G | 2010-10-19 | 639 | R+7.0 | R+4.1 | R+2.9 |
| 2010 | 2010_House-G_OR-5 | House-G | 2010-10-18 | 601 | R+10.0 | D+5.3 | R+15.3 |
| 2010 | 2010_Sen-G_CA | Sen-G | 2010-10-17 | 621 | D+2.0 | D+10.0 | R+8.0 |
| 2010 | 2010_House-G_OR-1 | House-G | 2010-10-17 | 602 | D+9.0 | D+12.8 | R+3.8 |
| 2010 | 2010_Gov-G_CA | Gov-G | 2010-10-17 | 621 | D+7.0 | D+12.9 | R+5.9 |
| 2010 | 2010_Sen-G_WA | Sen-G | 2010-10-13 | 612 | D+3.0 | D+4.7 | R+1.7 |
| 2010 | 2010_Sen-G_OR | Sen-G | 2010-10-13 | 652 | D+22.0 | D+18.0 | D+4.0 |
| 2010 | 2010_House-G_WA-3 | House-G | 2010-10-13 | 579 | R+11.0 | R+5.9 | R+5.1 |
| 2010 | 2010_House-G_MN-1 | House-G | 2010-10-13 | 584 | D+5.0 | D+5.3 | R+0.3 |
| 2010 | 2010_Gov-G_OR | Gov-G | 2010-10-13 | 652 | D+1.0 | D+1.5 | R+0.5 |
| 2010 | 2010_Gov-G_NM | Gov-G | 2010-10-13 | 647 | R+12.0 | R+6.7 | R+5.3 |
| 2010 | 2010_Sen-G_NY | Sen-G | 2010-10-12 | 633 | D+33.0 | D+34.1 | R+1.1 |
| 2010 | 2010_Sen-GS_NY | Sen-G | 2010-10-12 | 633 | D+18.0 | D+27.8 | R+9.8 |
| 2010 | 2010_Sen-GS_DE | Sen-G | 2010-10-12 | 2,355 | D+21.0 | D+16.6 | D+4.4 |
| 2010 | 2010_House-G_VA-9 | House-G | 2010-10-12 | 633 | D+10.0 | R+4.8 | D+14.8 |
| 2010 | 2010_Gov-G_NY | Gov-G | 2010-10-12 | 633 | D+26.0 | D+29.3 | R+3.3 |
| 2010 | 2010_Gov-G_MN | Gov-G | 2010-10-12 | 712 | D+5.0 | D+0.4 | D+4.6 |
| 2009 | 2009_Gov-G_VA | Gov-G | 2009-10-31 | 502 | R+18.0 | R+17.4 | R+0.6 |
| 2009 | 2009_Gov-G_NJ | Gov-G | 2009-10-31 | 582 | R+3.0 | R+3.6 | D+0.6 |
| 2009 | 2009_House-GS_CA-10 | House-G | 2009-10-27 | 581 | D+10.0 | D+10.0 | R+0.0 |
| 2009 | 2009_Gov-G_NJ | Gov-G | 2009-10-27 | 640 | 0 | R+3.6 | D+3.6 |
| 2009 | 2009_Gov-G_VA | Gov-G | 2009-10-26 | 502 | R+17.0 | R+17.4 | D+0.4 |
| 2009 | 2009_Gov-G_NJ | Gov-G | 2009-10-20 | 674 | R+2.0 | R+3.6 | D+1.6 |
| 2009 | 2009_Gov-G_VA | Gov-G | 2009-10-18 | 595 | R+19.0 | R+17.4 | R+1.6 |
| 2009 | 2009_Gov-G_NJ | Gov-G | 2009-10-13 | 611 | R+1.0 | R+3.6 | D+2.6 |
| 2008 | 2008_House-G_LA-4 | House-G | 2008-11-18 | 648 | R+2.0 | R+0.4 | R+1.6 |
| 2008 | 2008_Pres-G_PA | Pres-G | 2008-11-02 | 657 | D+9.0 | D+10.3 | R+1.3 |
| 2008 | 2008_Pres-G_FL | Pres-G | 2008-11-02 | 691 | D+3.0 | D+2.8 | D+0.2 |
| 2008 | 2008_Sen-G_NC | Sen-G | 2008-11-01 | 682 | D+7.0 | D+8.5 | R+1.5 |
| 2008 | 2008_Sen-G_GA | Sen-G | 2008-11-01 | 683 | R+4.0 | R+2.9 | R+1.1 |
| 2008 | 2008_Pres-G_WA | Pres-G | 2008-11-01 | 663 | D+16.0 | D+17.2 | R+1.2 |
| 2008 | 2008_Pres-G_OH | Pres-G | 2008-11-01 | 660 | D+2.0 | D+4.6 | R+2.6 |
| 2008 | 2008_Pres-G_NC | Pres-G | 2008-11-01 | 682 | R+1.0 | D+0.3 | R+1.3 |
| 2008 | 2008_Pres-G_MO | Pres-G | 2008-11-01 | 674 | 0 | R+0.1 | D+0.1 |
| 2008 | 2008_Pres-G_GA | Pres-G | 2008-11-01 | 683 | R+7.0 | R+5.2 | R+1.8 |
| 2008 | 2008_House-G_VA-5 | House-G | 2008-11-01 | 640 | R+3.0 | D+0.2 | R+3.2 |
| 2008 | 2008_House-G_PA-11 | House-G | 2008-11-01 | 622 | R+6.0 | D+3.3 | R+9.3 |
| 2008 | 2008_Gov-G_WA | Gov-G | 2008-11-01 | 663 | D+6.0 | D+6.5 | R+0.5 |
| 2008 | 2008_Gov-G_NC | Gov-G | 2008-11-01 | 682 | D+1.0 | D+3.4 | R+2.4 |
| 2008 | 2008_Gov-G_MO | Gov-G | 2008-11-01 | 674 | D+15.0 | D+18.9 | R+3.9 |
| 2008 | 2008_Sen-G_VA | Sen-G | 2008-10-31 | 672 | D+24.0 | D+31.3 | R+7.3 |
| 2008 | 2008_Sen-G_MN | Sen-G | 2008-10-31 | 669 | R+5.0 | D+0.0 | R+5.0 |
| 2008 | 2008_Sen-G_KY | Sen-G | 2008-10-31 | 616 | R+8.0 | R+5.9 | R+2.1 |
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.