Here is a review of Marquette Law School polling from 2017 to 2020 in Wisconsin. All polls are state-wide samples of registered voters, with about 800 respondents per poll and a margin of error of about +/- 4 percentage points. Details of each survey and full methodology statement are available at https://law.marquette.edu/poll/category/results-and-data/

Trump Job Approval Since Taking Office

Trump Job Approval in Wisconsin, Mar. 2017-Oct. 2020
Poll date net Approve Disapprove Don’t know Refused
2017-03-16 -6 41 47 11 1
2017-06-25 -10 41 51 7 1
2018-03-01 -7 43 50 6 1
2018-06-17 -6 44 50 5 1
2018-07-15 -8 42 50 7 1
2018-08-19 -6 45 51 3 1
2018-09-16 -12 42 54 3 1
2018-10-07 -5 46 51 3 1
2018-10-28 -3 47 50 2 1
2019-01-20 -8 44 52 4 0
2019-04-07 -6 46 52 1 1
2019-08-29 -8 45 53 1 1
2019-10-17 -5 46 51 2 1
2019-11-17 -4 47 51 1 1
2019-12-08 -3 47 50 2 1
2020-01-12 -1 48 49 2 1
2020-02-23 0 48 48 3 0
2020-03-29 -1 48 49 3 1
2020-05-07 -2 47 49 3 2
2020-06-18 -6 45 51 3 1
2020-08-09 -10 44 54 2 1
2020-09-03 -10 44 54 2 1
2020-10-04 -8 44 52 2 1
2020-10-25 -5 47 52 1 0

Trump approval handling economy

Trump Approval Handling Economy in Wisconsin, Aug. 2019-Oct. 2020
Poll date net Approve Disapprove Don’t know Refused
2019-08-29 -1 49 50 1 1
2019-10-17 6 51 45 4 0
2019-11-17 12 55 43 2 0
2019-12-08 8 53 45 2 1
2020-01-12 13 55 42 3 1
2020-02-23 15 56 41 2 1
2020-03-29 13 54 41 4 0
2020-05-07 14 54 40 4 2
2020-06-18 4 50 46 3 1
2020-08-09 5 51 46 3 0
2020-09-03 8 52 44 2 1
2020-10-04 6 51 45 4 0
2020-10-25 3 51 48 1 0

Trump approval handling coronoavirus

Trump Approval Handling Coronavirus in Wisconsin, Mar. 2020-Oct. 2020
Poll date net Approve Disapprove Don’t know Refused
2020-03-29 5 51 46 2 0
2020-05-07 -7 44 51 3 1
2020-06-18 -8 44 52 3 1
2020-08-09 -18 40 58 2 0
2020-09-03 -15 41 56 2 1
2020-10-04 -15 41 56 3 1
2020-10-25 -18 40 58 2 1

Trump approval handling BLM protests

Trump Approval Handling Black Lives Matter Protests in Wisconsin, June 2020-Oct. 2020
Poll date net Approve Disapprove Don’t know Refused
2020-06-18 -28 30 58 11 1
2020-08-09 -26 32 58 9 1
2020-09-03 -18 36 54 8 2
2020-10-04 -17 37 54 8 1
2020-10-25 -14 40 54 6 1