The Associated Press-GfK poll on the midterm elections was conducted by GfK Public Affairs and Corporate Communications September 25-29. It is based on online interviews of 1,845 adults who are members of GfK’s nationally representative KnowledgePanel.
The original sample was drawn from a panel of respondents recruited via phone or mail survey methods. GfK provides Internet access to panel recruits who don’t already have it. With a probability basis and coverage of people who otherwise couldn’t access the Internet, online surveys using KnowledgePanel are nationally representative.
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