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2012 President · CO

SurveyUSA · fieldwork ended 2012-10-30 (7 days before the election) · 695 respondents · IVR/Online Panel

The poll said

Democrat 47% · Republican 45%

D+2.0

The certified result

Democrat 51.49% · Republican 46.13%

D+5.4

The arithmetic

  1. Poll margin = 47 − 45 = 2.00
  2. Actual margin = 51.492 − 46.127 = 5.365
  3. Signed miss = 2.00 − (5.365) = -3.365
  4. Absolute miss = |-3.365| = 3.365

The poll overstated the Republican by 3.4 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 30590, race ID 658 (538 database).