Methods 101 is a video series from the Pew Research Center designed to help the public understand the methods used in Pew's survey research.
Pew conducts monthly polls on major policy issues and describes itself as "an independent, non-partisan public opinion research organization that studies attitudes toward politics, the press and public policy issues."
Freely accessible websites that compile public opinion data:
The following are links to various major US media outlets' polling divisions.
