We’re in an era where the people most likely to respond to a poll are also the most likely to vote Democratic for president. Pew Research Center’s head methodologist, Courtney Kennedy, explains how pollsters are tackling this challenge to make samples as representative as possible. Creative Director & Story Editor: Kimberly Arias Executive Producer & Story Editor: Sara Atske Research & Story Editor: Courtney Kennedy Animation Director: Fabian Tejada Design: Jesus Cardenas Video: Antonio Villaronga Sound Editing: Chris Mastellone Thanks to: Andrea Caumont, Nida Asheer, Ashley Amaya, Peter Bell, David Kent, Stacy Rosenberg, Mithila Samak and Blythe Thomas 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 posit...