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2020 Senate · MI

SSRS · fieldwork ended 2020-10-27 (7 days before the election) · 907 respondents · Live Phone

The poll said

Democrat 52% · Republican 40%

D+12.0

The certified result

Democrat 49.90% · Republican 48.22%

D+1.7

The arithmetic

  1. Poll margin = 52 − 40 = 12.00
  2. Actual margin = 49.903 − 48.218 = 1.685
  3. Signed miss = 12.00 − (1.685) = 10.315
  4. Absolute miss = |10.315| = 10.315

The poll overstated the Democrat by 10.3 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 72416, race ID 6280 (538 database).