See the latest Pew Research Center data on U.S. political party affiliation, including trends in voting and elections.
Ask the Expert: Factors Behind the Partisan Gap
Scott Keeter, Director of Survey Research, answers questions about the factors behind the growing partisan gap in American politics.
Slideshow: Religious Groups and Political Party Identification
A new slideshow illustrates trends in support for the U.S. political parties among various religious groups since 2008.
Quiz: Political Party
Answer 12 questions that were part of a national survey conducted by the Pew Research Center, and find out where you fit on the partisan political spectrum.
A Closer Look at the Parties in 2012
As the 2012 party conventions approach, the Democratic Party continues to maintain an advantage in party identification among voters, but its lead is much smaller than it was in 2008.
Party Affiliation and Election Polls
In every campaign cycle, pollwatchers pay close attention to the details of every election survey. And well they should. But focusing on the partisan balance of surveys is, in almost every circumstance, the wrong place to look.
Two-Thirds of Democrats Now Support Gay Marriage
Reports that the Democratic Party may add support for gay marriage to its party platform are in keeping with a significant shift of opinion on this issue among Democrats nationwide. A new report finds that support for same-sex marriage among Democrats has jumped from 50% in 2008 to 65% today.
Partisan Polarization Surges in Bush, Obama Years
Americans values and basic beliefs are more polarized along partisan lines than at any point in the past 25 years. Party has now become the single largest fissure in American society, with the values gap between Republicans and Democrats greater than gender, age, race or class divides.
Romney Split White Evangelical Voters with Santorum in Tuesday Primaries
In winning the Wisconsin and Maryland GOP presidential primaries on Tuesday, Mitt Romney ran neck-and-neck with Rick Santorum among white born-again/evangelical voters, while Romney was the clear favorite of non-evangelical voters.
Religion and the 2012 Louisiana Republican Primary
In winning the Louisiana GOP presidential primary, Rick Santorum won the majority of votes cast by white evangelical/born-again Christians, people who attend worship services weekly and voters who say it is at least somewhat important to have a candidate who shares their religious beliefs. He also won a clear victory among Catholic voters for the first time this primary season.
Religion and the 2012 Illinois Republican Primary
In winning the Illinois Republican presidential primary, Mitt Romney continued to draw less support from white born-again/evangelical voters than from non-evangelicals, while Rick Santorum has yet to secure an outright victory among Catholic voters in any state for which data are available.