https://www.pewresearch.org/politics/2012/12/13/about-the-surveys-21/
About the Surveys | Pew Research Center
Apr 14, 2024 - Most of the analysis in this report is based on telephone interviews conducted December 5-9, 2012 among a national sample of 1,503 adults, 18 years of age or...
about the surveyspew researchcenter