| 4/9/2026 | Echelon Insights | 1.00 | —(R+1.0) | 378 | ±6.3 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡n=378+3- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
n=378 Sample size of 378 respondents implies a margin of error around ±5.0pt — wider than typical. - 🟡
high variance vs editorial consensus Stdev of (poll − rater consensus) across 45 historical paired polls exceeds 8pt — this pollster's results swing widely relative to where the editors place the same races. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 45.0 · Graham Platner 51.0 | pollarch |
| 4/9/2026 | Echelon Insights | 1.00 | —(R+1.0) | 378 | ±6.3 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡n=378+3- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
n=378 Sample size of 378 respondents implies a margin of error around ±5.0pt — wider than typical. - 🟡
high variance vs editorial consensus Stdev of (poll − rater consensus) across 45 historical paired polls exceeds 8pt — this pollster's results swing widely relative to where the editors place the same races. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 46.0 · Janet Mills 48.0 | pollarch |
| 3/31/2026 | Maine People's Resource Center | 1.00 | — | 1167 | ±2.9 | LV | 🟠commissioned by D-aligned: Internal D-aligned🟡no scored polls+2- 🟠
commissioned by D-aligned: Internal D-aligned This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 39.0 · Graham Platner 48.0 | pollarch |
| 3/31/2026 | Maine People's Resource Center | 1.00 | — | 1167 | ±2.9 | LV | 🟠commissioned by D-aligned: Internal D-aligned🟡no scored polls+2- 🟠
commissioned by D-aligned: Internal D-aligned This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 45.0 · Janet Mills 42.0 | pollarch |
| 3/23/2026 | Emerson College | 1.00 | —(D+0.7) | 1075 | ±2.9 | LV | ⚪✓ verified 5d ago⚪likely-voter screen+2- ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls. - 🔵
tracks editorial consensus Across 234 historical paired polls, this pollster's D-margins track the rater consensus (Cook / Sabato / IE / 538 / DDHQ etc.) with high correlation (r ≥ 0.85) and small mean delta (|Δ| ≤ 2pt). Their results align with conventional wisdom. - 🟢
accurate · bias D+0.7pt Across 117 historical scored polls this pollster's average error vs. actual margin is D+0.7pt — within ±1pt.
| Susan Collins 41.0 · Graham Platner 48.0 | pollarch |
| 3/23/2026 | Emerson College | 1.00 | —(D+0.7) | 1075 | ±2.9 | LV | ⚪✓ verified 5d ago⚪likely-voter screen+2- ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls. - 🔵
tracks editorial consensus Across 234 historical paired polls, this pollster's D-margins track the rater consensus (Cook / Sabato / IE / 538 / DDHQ etc.) with high correlation (r ≥ 0.85) and small mean delta (|Δ| ≤ 2pt). Their results align with conventional wisdom. - 🟢
accurate · bias D+0.7pt Across 117 historical scored polls this pollster's average error vs. actual margin is D+0.7pt — within ±1pt.
| Susan Collins 43.0 · Janet Mills 46.0 | pollarch |
| 3/8/2026 | OnMessage Public Strategies | 1.00 | R | 600 | ±4.0 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡no scored polls+3- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
63d old Poll was fielded 63 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 42.0 · Graham Platner 44.0 | pollarch |
| 3/8/2026 | OnMessage Public Strategies | 1.00 | R | 600 | ±4.0 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡no scored polls+3- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
63d old Poll was fielded 63 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 42.0 · Janet Mills 42.0 | pollarch |
| 3/5/2026 | Quantus Insights | 1.00 | R | 800 | ±3.4 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡no scored polls+4- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
66d old Poll was fielded 66 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
D+5.2pt vs editors Across 5 historical polls where ≥2 editorial raters had rated the race (Cook / Sabato / IE / 538 / DDHQ etc.), this pollster's D-margin averaged 5.2pt MORE D-favorable than the rater consensus. Systematic D-lean relative to conventional wisdom. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 42.0 · Graham Platner 49.0 | pollarch |
| 3/5/2026 | Quantus Insights | 1.00 | R | 800 | ±3.4 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡no scored polls+4- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
66d old Poll was fielded 66 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
D+5.2pt vs editors Across 5 historical polls where ≥2 editorial raters had rated the race (Cook / Sabato / IE / 538 / DDHQ etc.), this pollster's D-margin averaged 5.2pt MORE D-favorable than the rater consensus. Systematic D-lean relative to conventional wisdom. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 45.0 · Janet Mills 43.0 | pollarch |
| 3/2/2026 | Pan Atlantic Research | 1.00 | — | 810 | ±3.7 | LV | 🟡no scored polls🟡69d old+3- 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
69d old Poll was fielded 69 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
uncorrelated with editorial consensus Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 40.0 · Graham Platner 44.0 | pollarch |
| 3/2/2026 | Pan Atlantic Research | 1.00 | — | 810 | ±3.7 | LV | 🟡no scored polls🟡69d old+3- 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
69d old Poll was fielded 69 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
uncorrelated with editorial consensus Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 44.0 · Janet Mills 44.0 | pollarch |
| 2/16/2026 | University of New Hampshire | 1.00 | —(R+0.9) | 1105 | ±2.9 | LV | 🟡83d old🟡high variance vs editorial consensus+3- 🟡
83d old Poll was fielded 83 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
high variance vs editorial consensus Stdev of (poll − rater consensus) across 50 historical paired polls exceeds 8pt — this pollster's results swing widely relative to where the editors place the same races. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls. - 🔵
bias R+0.9pt Across 12 historical scored polls the average error vs. actual margin is R+0.9pt.
| Susan Collins 38.0 · Graham Platner 49.0 | pollarch |
| 2/16/2026 | University of New Hampshire | 1.00 | —(R+0.9) | 1105 | ±2.9 | LV | 🟡83d old🟡high variance vs editorial consensus+3- 🟡
83d old Poll was fielded 83 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
high variance vs editorial consensus Stdev of (poll − rater consensus) across 50 historical paired polls exceeds 8pt — this pollster's results swing widely relative to where the editors place the same races. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls. - 🔵
bias R+0.9pt Across 12 historical scored polls the average error vs. actual margin is R+0.9pt.
| Susan Collins 40.0 · Janet Mills 41.0 | pollarch |
| 1/24/2026 | Fabrizio, Lee & Associates | 1.00 | R | 800 | ±3.5 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡no scored polls+4- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
106d old Poll was fielded 106 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
high variance vs editorial consensus Stdev of (poll − rater consensus) across 14 historical paired polls exceeds 8pt — this pollster's results swing widely relative to where the editors place the same races. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 45.0 · Graham Platner 44.0 | pollarch |
| 1/24/2026 | Fabrizio, Lee & Associates | 1.00 | R | 800 | ±3.5 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡no scored polls+4- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
106d old Poll was fielded 106 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
high variance vs editorial consensus Stdev of (poll − rater consensus) across 14 historical paired polls exceeds 8pt — this pollster's results swing widely relative to where the editors place the same races. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 45.0 · Janet Mills 44.0 | pollarch |
| 12/16/2025 | Workbench Strategy | 1.00 | L | 900 | ±4.4 | LV | 🟠commissioned by D-aligned: Internal D-aligned🟡no scored polls+3- 🟠
commissioned by D-aligned: Internal D-aligned This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
145d old Poll was fielded 145 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 50.0 · Graham Platner 50.0 | pollarch |
| 12/16/2025 | Workbench Strategy | 1.00 | L | 900 | ±4.4 | LV | 🟠commissioned by D-aligned: Internal D-aligned🟡no scored polls+3- 🟠
commissioned by D-aligned: Internal D-aligned This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
145d old Poll was fielded 145 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 51.0 · Janet Mills 49.0 | pollarch |
| 12/7/2025 | Pan Atlantic Research | 1.00 | — | 820 | ±3.7 | LV | 🟡no scored polls🟡154d old+3- 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
154d old Poll was fielded 154 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
uncorrelated with editorial consensus Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 42.0 · Graham Platner 43.0 | pollarch |
| 12/7/2025 | Pan Atlantic Research | 1.00 | — | 820 | ±3.7 | LV | 🟡no scored polls🟡154d old+3- 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
154d old Poll was fielded 154 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
uncorrelated with editorial consensus Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 43.0 · Janet Mills 43.0 | pollarch |
| 11/11/2025 | Cygnal | 1.04 | R(D+1.8) | 600 | ±4.0 | LV | 🟠commissioned by R-aligned: Internal R-aligned🟡180d old+3- 🟠
commissioned by R-aligned: Internal R-aligned This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor. - 🟡
180d old Poll was fielded 180 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls. - 🔵
tracks editorial consensus Across 72 historical paired polls, this pollster's D-margins track the rater consensus (Cook / Sabato / IE / 538 / DDHQ etc.) with high correlation (r ≥ 0.85) and small mean delta (|Δ| ≤ 2pt). Their results align with conventional wisdom.
| Susan Collins 41.0 | pollarch |
| 10/29/2025 | Maine People's Resource Center | 1.00 | — | 783 | ±3.5 | LV | 🟡no scored polls🟡193d old+2- 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
193d old Poll was fielded 193 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 41.0 · Graham Platner 45.0 | pollarch |
| 10/29/2025 | Maine People's Resource Center | 1.00 | — | 783 | ±3.5 | LV | 🟡no scored polls🟡193d old+2- 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
193d old Poll was fielded 193 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 46.0 · Janet Mills 42.0 | pollarch |
| 10/10/2025 | Zenith Research | 1.00 | L | 501 | ±4.4 | LV | 🟠commissioned by D-aligned: Internal D-aligned🟡no scored polls+3- 🟠
commissioned by D-aligned: Internal D-aligned This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
212d old Poll was fielded 212 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 38.0 · Graham Platner 38.0 | pollarch |
| 10/10/2025 | Zenith Research | 1.00 | L | 501 | ±4.4 | LV | 🟠commissioned by D-aligned: Internal D-aligned🟡no scored polls+3- 🟠
commissioned by D-aligned: Internal D-aligned This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor. - 🟡
no scored polls Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured. - 🟡
212d old Poll was fielded 212 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
likely-voter screen Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
| Susan Collins 37.0 · Janet Mills 42.0 | pollarch |
| 9/9/2025 | Public Policy Polling | 1.00 | —(D+1.1) | 642 | — | RV | 🟠commissioned by D-aligned: Internal D-aligned🟡243d old+4- 🟠
commissioned by D-aligned: Internal D-aligned This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor. - 🟡
243d old Poll was fielded 243 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average. - 🟡
uncorrelated with editorial consensus Across 368 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results. - ⚪
✓ verified 5d ago auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched. - ⚪
registered voters Registered-voter sample — broader than likely-voter screens; typical for early-cycle polling before turnout signals stabilize. - 🔵
bias D+1.1pt Across 72 historical scored polls the average error vs. actual margin is D+1.1pt.
| Susan Collins 35.0 · Dan Kleban 44.0 | pollarch |
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