How Does 2022 Midterm Polling Error Vary by Poll Characteristics?

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A Preliminary Look at Polling Error in the 2022 Midterm Election

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Contextualizing Uncertainty in Joe Biden’s Early Presidential Approval Polls

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2020 State Polling Volume and Quality along State Competitiveness

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Edit 11/25/20: Another relevant graph (see here for context).

2020 Polling Error by Survey Mode

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2020 National and State Polling Error Over the Course of Year before Election Day

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2020 State Polling Error in (Recent) Historical Context

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Have 65+ Old Voters Become More Democratic in Vote Choice So Far in 2020?

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5/3/20 update:

I’ve written up these results for the Data for Progress blog. Find the post here.

2016 State Polling Error Over Time

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4/13/20 update:

The same analysis above but now for polling around the 2008 and 2012 elections.

Partisan Sample Composition and Horserace Results in the 2018 Midterm Election

See here for context and here for more discussion on the topic.