2020 polls badly understated support for GOP candidates, review finds, and nobody's sure why


The 2020 polls were off by an "unusual magnitude," missing the national results by the biggest margin in 40 years and erring in state surveys by the greatest amount in at least 20 years, according to a new study released Monday by the American Association for Public Opinion Research (AAPOR).
"There was a systematic error that was found in terms of the overstatement for Democratic support across the board," said Vanderbilt University political scientist Josh Clinton, chair of the 19-member task force. "It didn't matter what type of poll you were doing, whether you're interviewing by phone or internet or whatever. And it didn't matter what type of race, whether President Trump was on the ballot or was not on the ballot."
The task force reviewed 2,858 presidential polls and found they were off by 3.9 percentage points nationally and 4.3 percent at the state level. The numbers for President Biden were fairly accurate, about a point higher than his final vote count, but Trump's "support was understated by a whopping 3.3 points on average," Politico reports. "The polls of Senate and governor's races were off by an even greater margin: 6 points on average."
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
All 66 national polls conducted in the last two weeks accurately predicted that Biden would win, the report found, but only 66 percent of Senate polls correctly forecast the winner.
The task force determined that pollsters had largely corrected the errors from the 2016 polling, including under-sampling voters with no college degree. "It's hard to prove beyond a certainty what happened," Clinton said, but "we have some good prime suspects as to what may be going on."
Probably the likeliest theory is that pro-Trump Republicans specifically refused to talk to pollsters, while "self-identified Republicans who choose to respond to polls are more likely to support Democrats," the report posited, skewing the sample of GOP voters.
The task force ruled out a sizable "shy Trump voter" effect and found that the predicted composition of the electorate was largely accurate. "Identifying conclusively why polls overstated the Democratic-Republican margin relative to the certified vote appears to be impossible with the available data," the report found. That leaves pollsters with little guidance for 2022 and 2024. "We'll have to wait and see what happens — which isn't a particularly reassuring position," Clinton said. "But I think that's the honest answer." You can read the full report at AAPOR.
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.
-
'This is a coordinated campaign of harassment'
Instant Opinion Opinion, comment and editorials of the day
-
Trump nominates Powell critic for vacant Fed seat
speed read Stephen Miran, the chair of Trump's Council of Economic Advisers and a fellow critic of Fed chair Jerome Powell, has been nominated to fill a seat on the Federal Reserve Board of Governors
-
Israeli security cabinet OKs Gaza City takeover
Speed Read Netanyahu approved a proposal for Israeli Defense Forces to take over the largest population center in the Gaza Strip
-
Trump nominates Powell critic for vacant Fed seat
speed read Stephen Miran, the chair of Trump's Council of Economic Advisers and a fellow critic of Fed chair Jerome Powell, has been nominated to fill a seat on the Federal Reserve Board of Governors
-
JD Vance rises as MAGA heir apparent
IN THE SPOTLIGHT The vice president is taking an increasingly proactive role in a MAGA movement roiled by scandal and anxious about a post-Trump future
-
Congress should 'step in' to block Trump's White House ballroom makeover
Instant Opinion Opinion, comment and editorials of the day
-
ICE scraps age limits amid hiring push
Speed Read Anyone 18 or older can now apply to be an ICE agent
-
Trump's global tariffs take effect, with new additions
Speed Read Tariffs on more than 90 US trading partners went into effect, escalating the global trade war
-
House committee subpoenas Epstein files
Speed Read The House Oversight Committee has issued a subpoena to the Justice Department for its Jeffrey Epstein files with an Aug. 19 deadline
-
Eighty years after Hiroshima: how close is nuclear conflict?
Today's Big Question Eight decades on from the first atomic bomb 'we have blundered into a new age of nuclear perils'
-
Epstein: A boon for Democrats?
Feature Democrats' push to release the Epstein files splits the GOP, sending the House into an early summer recess