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2010 Governor · CA

SurveyUSA · fieldwork ended 2010-10-28 (5 days before the election) · 587 respondents · IVR/Live Phone

The poll said

Democrat 48% · Republican 37%

D+11.0

The certified result

Democrat 53.77% · Republican 40.88%

D+12.9

The arithmetic

  1. Poll margin = 48 − 37 = 11.00
  2. Actual margin = 53.770 − 40.885 = 12.885
  3. Signed miss = 11.00 − (12.885) = -1.885
  4. Absolute miss = |-1.885| = 1.885

The poll overstated the Republican by 1.9 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 32835, race ID 1278 (538 database).