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2010 Governor · CA

YouGov · fieldwork ended 2010-10-30 (3 days before the election) · 810 respondents · Online Panel

The poll said

Democrat 51% · Republican 41%

D+10.0

The certified result

Democrat 53.77% · Republican 40.88%

D+12.9

The arithmetic

  1. Poll margin = 51 − 41 = 10.00
  2. Actual margin = 53.770 − 40.885 = 12.885
  3. Signed miss = 10.00 − (12.885) = -2.885
  4. Absolute miss = |-2.885| = 2.885

The poll overstated the Republican by 2.9 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 32829, race ID 1278 (538 database).