KnowledgePanel is designed to be representative of the U.S. population. Respondents were first selected randomly using phone or mail survey methods, and later completed this survey online. People selected for KnowledgePanel who didn't otherwise have Internet access were provided with access at no cost to them.
AP-GfK Poll: http://www.ap-gfkpoll.com
Scott Mayerowitz can be reached at http://twitter.com/GlobeTrotScott