Pew Research Center survey reports, demographic studies and data-driven analysis.
Confronting 2016 and 2020 Polling Limitations
Looking at final estimates of the outcome of the 2020 U.S. presidential race, 93% of national polls overstated the Democratic candidate’s support among voters, while nearly as many (88%) did so in 2016.
Q&A: After misses in 2016 and 2020, does polling need to be fixed again? What our survey experts say
Polling organizations have taken close looks at how election surveys are designed, administered and analyzed. We are no exception.
What 2020’s Election Poll Errors Tell Us About the Accuracy of Issue Polling
Given the errors in 2016 and 2020 election polling, how much should we trust polls that attempt to measure opinions on issues?
How we know the drop in Trump’s approval rating in January reflected a real shift in public opinion
The 9-point fall in approval was the largest change between two Pew Research Center polls since Donald Trump took office.
Understanding how 2020 election polls performed and what it might mean for other kinds of survey work
Many who follow polls are asking how these errors could happen. Here, we’ll take a preliminary shot at answering that question.
A voter data resource: Detailed demographic tables about verified voters in 2016, 2018
Data tables from interviews we conducted with verified voters after the 2016 and 2018 elections may help answer some election 2020 questions.
What we can trust 2020 election polls to tell us
Polls can't predict the future. But they are the best tool to reveal the public’s priorities and values, and why people vote the way they do.
Democrats Made Gains From Multiple Sources in 2018 Midterm Victories
Our analysis of verified voters examines what 2016 voters and nonvoters did in the 2018 midterm elections and offers a detailed portrait of the demographic composition and vote choices of the 2018 electorate.
A Resource for State Preelection Polling
If a battleground state poll does not adjust for having too many college graduates, it is at risk of overstating support for a Democratic presidential candidate. The Current Population Survey provides high-quality data that can mitigate overrepresentation of college graduates.
Key things to know about election polling in the United States
The real environment in which polls are conducted bears little resemblance to the idealized settings presented in textbooks.
About Pew Research Center Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research. Pew Research Center does not take policy positions. It is a subsidiary of The Pew Charitable Trusts.