Historically, most public opinion polls did not weight on past (recalled) vote, and experts have highlighted the challenges of the practice. But polling has changed dramatically in the past quarter ...

Explore trends in partisan identification among U.S. adults using data from Pew Research Center’s National Public Opinion Reference Survey (NPORS).

Pew Research Center launched a new project called the National Public Opinion Reference Survey (NPORS). NPORS is an annual, cross-sectional survey of U.S. adults. Respondents can answer either by ...