Skip to content
535

Minnesota Senate

Tossup

Democrats63%

This race is a Tossup — the leading side wins 63,259 of 100,000 simulated elections.

Tossup

Democrats64%

This race is a Tossup — the leading side wins 63,883 of 100,000 simulated elections.

Forecast detail

as of Oct 4, 2026, 2:30 AM EDT

Estimated margin

D+1.8

5th–95th interval

R+7.2 to D+10.9

Estimated margin

D+1.9

5th–95th interval

R+7.1 to D+11.0

Win probability over time

Dem win probability Rep win probability Tossup band

Polls

Dem-leaning poll Rep-leaning poll current average: D+1.9 current average: D+1.9

Polls from partisan-aligned sponsors are shown but not in this view's average — flip “Partisan internals” in the header to include them.Partisan-sponsored polls are in this view's average, shifted 0.7 points toward the non-sponsor party and given half weight — methodology.

Pollster Dates Sample Results Margin House adj. Source
Marisa Simonetti (I) vs Michele Tafoya (R) vs Peggy Flanagan (D) vs Rebecca Whiting (LIB) · 7 polls
Big Data Poll Sep 29–Sep 30, 2026 622 lv Dem 45.8% Rep 43.6% Ind 5.4% Other 5.2% D+2.2 D+0.8 D+1.4 lean removed Source
InsiderAdvantage Sep 28–Sep 29, 2026 1,200 lv Dem 46.0% Rep 45.0% Other 2.0% Ind 1.0% D+1.0 D+1.9 R+0.9 lean removed Source
co/efficient Sep 14–Sep 15, 2026 833 lv Dem 43.0% Rep 42.0% Ind 2.0% Other 2.0% D+1.0 D+3.3 R+2.3 lean removed Source
SurveyUSA Sep 9–Sep 14, 2026 654 lv Dem 42.0% Rep 42.0% Ind 2.0% Other 2.0% Even — Source
TIPP Insights rep sponsor Aug 31–Sep 2, 2026 1,494 rv Dem 40.0% Rep 38.0% Ind 4.1% Other 1.1% D+2.0 D+2.9 R+0.9 lean removed Source
TIPP Insights rep sponsor Aug 31–Sep 2, 2026 1,192 lv Dem 44.0% Rep 41.9% Ind 3.0% Other 1.0% D+2.1 D+3.0 R+0.9 lean removed Source
SurveyUSA Aug 13–Aug 17, 2026 661 lv Dem 46.0% Rep 41.0% Ind 1.0% Other 1.0% D+5.0 — Source
Michele Tafoya (R) vs Peggy Flanagan (D) · 5 polls
Quantus Insights Sep 8–Sep 10, 2026 720 lv Dem 48.9% Rep 45.4% D+3.5 D+4.6 R+1.1 lean removed Source
Impact Research dem sponsor May 26–May 28, 2026 808 lv Dem 51.0% Rep 44.0% D+7.0 — Source
Emerson College Feb 6–Feb 8, 2026 1,000 lv Dem 47.1% Rep 40.6% D+6.5 D+5.8 D+0.7 lean removed Source
Impact Research dem sponsor Jul 8–Jul 11, 2025 604 lv Dem 48.0% Rep 45.0% D+3.0 — Source
Impact Research dem sponsor Jul 8–Jul 11, 2025 604 lv Dem 48.0% Rep 45.0% D+3.0 — Source
Angie Craig (D) vs Michele Tafoya (R) · 4 polls
Impact Research dem sponsor May 26–May 28, 2026 808 lv Dem 51.0% Rep 44.0% D+7.0 — Source
Emerson College Feb 6–Feb 8, 2026 1,000 lv Dem 46.6% Rep 40.2% D+6.4 D+5.7 D+0.7 lean removed Source
Impact Research dem sponsor Jul 8–Jul 11, 2025 604 lv Dem 49.0% Rep 45.0% D+4.0 — Source
Impact Research dem sponsor Jul 8–Jul 11, 2025 604 lv Dem 49.0% Rep 45.0% D+4.0 — Source

Dispatches about this race

Movement note Minnesota Senate Oct 3, 2026

Minnesota Senate forecast drops 28 points in four days as two close polls arrive

Our model's projected Democratic margin narrowed from 7.7 points to 1.8 between the September 29 and October 3 runs, and its range of outcomes now extends well into Republican territory.

Our model has moved 28.3 points toward the Republican in Minnesota's open Senate race over four days. The September 29 run gave the Democrat a 92% chance of winning. The October 3 run gives the Democrat a 63 in 100 chance, and the Republican 37%.

The expected margin moved with it. Our model's...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5.5

Poll reaction Minnesota Senate Oct 2, 2026

Minnesota Senate poll shows a close race as our forecast slips to 63 percent

A Big Data Poll survey has the Democrat at 45.8 percent and the Republican at 43.6, and our projected margin narrows by two points.

A new Big Data Poll survey of the open Minnesota Senate seat, sponsored by the Public Polling Project, finds the race close. The poll of 622 likely voters, fielded September 29-30, puts the Democrat at 45.8 percent and the Republican at 43.6 percent. An independent draws 5.4 percent and other...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5.5

Poll reaction Minnesota Senate Sep 30, 2026

Minnesota Senate poll shows a 46-45 race as our forecast falls to 70 percent

A one-point InsiderAdvantage result cuts our average Democratic margin in the open-seat race from 7.8 points to 2.9 in a single model run.

A new InsiderAdvantage survey of 1,200 likely voters, fielded September 28-29, finds the Minnesota Senate race close. The Democrat takes 46 percent and the Republican 45 percent, with 2 percent for other candidates and 1 percent for an independent. A one-point gap is not a lead. The poll...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5.5

Movement note Minnesota Senate Sep 29, 2026

Minnesota Senate forecast moves to 92 percent for the Democrat

Our model's Democratic win probability rose 8.2 points in six days, and the payload records no new Minnesota polling to account for the change.

Our model now gives the Democrat a 92 in 100 chance of winning Minnesota's open Senate seat. That is up from 83% in our run of September 23 at 8:32 PM ET, a gain of 8.2 points of Democratic win probability over six days. The headline figures are rounded, which is why they differ by slightly more...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5.5

Movement note Minnesota Senate Sep 23, 2026

Minnesota Senate forecast returns to 83 percent for the Democrat

Our estimate rose 18.1 points in seven days, reversing a slide that had taken the race to 65 percent, with no new state polling in the payload to account for it.

Our model now gives the Democrat an 83 in 100 chance in Minnesota's open Senate race, up from 65 percent in our run of September 16. That is a move of 18.1 points toward the Democrat over seven days, and it undoes the decline we wrote about earlier this month.

The margin estimate moved with it....

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Poll reaction Minnesota Senate Sep 16, 2026

Minnesota Senate poll is tied at 42-42; our forecast eases to 65 percent

SurveyUSA's survey for KSTP-TV shows no separation, and our model now gives the Democrat a mean margin of 2.4 points in the open seat.

A SurveyUSA poll for KSTP-TV Minneapolis, fielded September 9-14 among 654 likely voters, has the Minnesota Senate race even at 42-42, with 2 percent for an independent candidate and 2 percent for other candidates.

Our model now gives the Democrat a 65 in 100 chance of winning the seat, down...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Poll reaction Minnesota Senate Sep 15, 2026

Minnesota Senate poll has the race at 43-42 as our forecast drops to 78 percent

A co/efficient survey of 833 likely voters is the closest reading yet in the open Minnesota Senate race, and our model moved with it.

A co/efficient survey of 833 likely voters in Minnesota, fielded September 14-15, put the Democrat at 43 percent and the Republican at 42 percent, with 2 percent for an independent and 2 percent for other candidates. That one-point gap is too small to call a lead. The race, on this poll, is...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Movement note Minnesota Senate Sep 15, 2026

Minnesota Senate forecast falls to 78 percent for the Democrat

Our estimate has moved 16.3 points toward the Republican in a week, and the newest poll shows a one-point margin.

Our model now gives the Democrat a 78 in 100 chance in the Minnesota Senate race, down from 94 percent in our run of September 8. That is a move of 16.3 points toward the Republican over seven days. Our projected margin narrowed over the same span, from D+9.7 to D+4.6, and our 5th-to-95th...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Poll reaction Minnesota Senate Sep 11, 2026

Minnesota Senate poll has Democrat at 48.9-45.4 as our forecast eases to 90 percent

The new survey is the closest single number in our Minnesota average this month, and our projected margin narrows to about eight points.

A Quantus Insights survey of 720 likely voters in Minnesota, fielded September 8-10, put the Democrat at 48.9 percent and the Republican at 45.4 percent. That is a gap of three and a half points on a sample of that size, close enough that the poll on its own does not establish who is ahead. It is...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Poll reaction Minnesota Senate Sep 8, 2026

Two Minnesota polls show a close race; our forecast stays at 94 percent

TIPP Insights puts the Democrat about two points up in both its likely-voter and registered-voter samples, and our model barely moved.

Two new surveys of the Minnesota Senate race from TIPP Insights, sponsored by the League of American Workers and fielded August 31 to September 2, both show a close contest. Among 1,192 likely voters, the Democrat took 43.96 percent to the Republican's 41.86, with 2.99 percent for an independent...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Poll reaction Minnesota Senate Aug 31, 2026

Minnesota Senate polling still shows a mid-single-digit Democratic edge

Our forecast nudges up to 93 percent for the Democrat after a batch of surveys that mostly predate the summer, with a mean margin of about 10 points.

The newly logged polling in Minnesota's open Senate race is not fresh, and it does not say anything the earlier numbers did not. The most recent of the group, an Impact Research survey of 808 likely voters fielded May 26-28, 2026, had the Democrat at 51 percent and the Republican at 44. An...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Poll reaction Minnesota Senate Aug 21, 2026

Minnesota poll has Democrat at 50-45 as our forecast eases to 87 percent

The new survey moved our estimate of the Democratic win chance down five points and widened the Republican tail of the margin range.

A Deep Root Analytics survey of 597 registered voters in Minnesota, fielded August 17-18, put the Democrat at 50 percent and the Republican at 45 percent. It is the only new poll in this race in our payload.

Our model now gives the Democrat an 87 in 100 chance in the Minnesota Senate race, with...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5

Poll reaction Minnesota Senate Aug 19, 2026

Minnesota Senate poll shows Democrat up five, and our forecast eases slightly

KTSP/SurveyUSA has the Democrat at 46 percent to the Republican's 41; our model now gives the Democrat a 91 percent chance in the open seat.

A KTSP/SurveyUSA survey of 661 likely voters in Minnesota, fielded August 13-17, puts the Democrat at 46 percent and the Republican at 41 percent. The poll leaves about 13 percent of likely voters unaccounted for between the two parties. No margin of error is attached to the numbers we have, and...

Read the full dispatch →

Written autonomously by anthropic/claude-opus-5