Weighting Polls on Party Affiliation and Past Vote
This report explains how political weighting works, how Pew Research Center does it, and some of its limitations.
Numbers, Facts and Trends Shaping Your World
Read our research on:
Voters & Voting
All
Voters & Voting
Publications
-
-
The U.S. Electorate’s Changing Racial and Ethnic Makeup
The share of eligible voters who are White has declined since 2006, while the Hispanic and Asian shares have nearly doubled. The share of Black eligible voters has changed little over the same period.
-
Most U.S. senators appointed since 1990 have run to keep their seat – and most have won
The U.S. Senate has had 43 appointed members since 1990, and 27 of them (63%) have run to keep their seat.
-
How confident are Americans in the midterm elections’ fairness and accuracy?
Just over half of Americans are confident the 2026 midterms will be fair.
-
Most Americans favor big changes to the political system that likely would require amending the Constitution
Most Americans support term limits, campaign spending caps, and Electoral College reform, but achieving these changes likely would require amending one of the world’s hardest constitutions to change.
-
Party Affiliation Fact Sheet (NPORS)
Explore trends in partisan identification among U.S. adults using data from Pew Research Center’s National Public Opinion Reference Survey (NPORS).
-
Republicans, Democrats continue to differ sharply on voting access
About six-in-ten Americans support no-excuse early or absentee voting, but partisan divides remain, with GOP support falling sharply since 2018.
-
Trump’s approval rating hits second-term low among his Latino voters, though many still approve
About two-thirds of Latino Trump voters (66%) approve of his job performance. That’s down 27 percentage points since the start of his second term.
-
Nearly 4 in 10 Americans wish they had options beyond the Republican and Democratic parties
Democrats and Democratic leaners are more likely than Republicans and GOP leaners to say they want more parties (46% vs. 29%).
-
Our favorite data visualizations of 2025
In this post, we’ll highlight a few of our favorite visuals from 2025 and walk through how we made them and what makes them successful.
