Gallup
“Provides data-driven news based on US and world polls, daily tracking and public opinion research.”
Rasmussen
“Specializes in the collection, publication, and distribution of public opinion polling information.”
PewResearchCenter
“Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping America and the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research.”