This report is a collaborative effort based on the input and analysis of the following individuals:

Primary Researchers Courtney Kennedy, Director, Survey Research Andrew Mercer, Research Methodologist Scott Keeter, Senior Survey Advisor Nick Hatley, Research Assistant Kyley McGeeney, Research Methodologist Alejandra Gimenez, Intern  

Collaborating Researchers Claudia Deane, Vice President, Research Samantha Smith, Research Assistant Andrew Perrin, Research Assistant Ruth Igielnik, Research Associate Amanda Lee, Intern Yanna Yan, Intern

Editorial and Graphic Design Michael Keegan, Information Graphics Designer Bill Webster, Information Graphics Designer David Kent, Copy Editor

Communications and Web Publishing Rachel Weisel, Communications Associate Travis Mitchell, Digital Producer

We would like to thank the vendors who took the time to meet with us and discuss their sample methodologies. Their input was tremendously helpful to this study. We would also like to thank Mike Brick, Nancy Mathiowetz, Jon Cohen and Sarah Cho, each of whom was very helpful in the early phases of this research. While their contributions were invaluable, Pew Research Center is solely responsible for the interpretation and reporting of the data.