PUBLISHED Mar. 25, 2021, at 10:00 AM

FiveThirtyEight’s Pollster Ratings

Based on the historical accuracy and methodology of each polling organization’s polls.

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Gordon S. Black Corp.

Pollsters with a relatively small number of polls now receive a provisional rating rather than a precise letter grade.
A/B
Polls analyzed2
Races called correctly100%
Most recent cycle1998
Affiliated with professional polling organization (NCPP/AAPOR/Roper)Yes

How accurate are the polls from Gordon S. Black Corp.?

Polls conducted within 21 days of an election (based on the poll’s median date) are used to determine the pollster’s grade.

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