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  • PEW research - Pew Research Center
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  • Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping America and the world. Conduct public opinion polling,...
  • Gallup - Gallup, Inc.
  • publisher
  • Gallup, Inc. is an American research-based, global performance-management consulting company. Founded by George Gallup in 1935, the company became known for its public opinion...