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The source for those sorts of detailed analyses of the electorate is Edison Research. The Somerville, New Jersey-based firm has conducted exit polls for the National Election Pool (a consortium of ABC, CBS, NBC, CNN, Fox and The Associated Press) since 2003 – originally in conjunction with Mitofsky International, and since 2006 on its own. But just how does Edison do it?
How exit polling is done
Here’s how The Associated Press provides results with speed and accuracy on which its member news organizations and subscribers rely.
Link to AP article.