PollingSource Logo

PollingSource

The number one source for political election data

Polling Trends
Senate House Governors Primaries Data Generic Ballot Pollsters Analysis Login Subscribe

← All pollster records

GreatBlue Research

4 scored general-election polls (2018–2020) , each measured against the certified result. How to read these numbers: methodology.

Record by cycle

CyclePollsAvg. ErrorLeanWinner Called
2020 1 4.9 pts D+4.9 100%
2018 3 3.0 pts R+1.3 67%

Every scored poll

DateRacePoll MarginActualErrorCalled It
2020-10-14 CT President D+25.0 D+20.1 4.9 ✓
2018-10-30 CT Governor R+2.4 D+3.7 6.1 ✗
2018-10-15 CT Governor D+3.4 D+3.7 0.3 ✓
2018-09-14 CT Governor D+6.2 D+3.7 2.5 ✓

Margins shown as party lead (D+/R+); for non-D-vs-R matchups the margin is first-listed candidate minus second. Historical scored-poll data for cycles through 2023 from FiveThirtyEight's pollster-ratings dataset (CC-BY-4.0); 2024 scored by PollingSource. This record never changes what enters the PollingSource average.

Support Independent Election Data PollingSource is free and non-partisan. Your donation helps us continue providing accurate election data.

© 2026 Innovative Research and Data Solutions, LLC. All rights reserved.

Data updated regularly from public polling sources.

As an Amazon Associate, PollingSource earns from qualifying purchases.

Methodology • Pollster Records • Privacy Policy • Terms of Service