… Since July, The Upshot has been working with CBS News to run the largest nationwide survey of midterm elections ever fielded. Data from the last wave of The New York Times/CBS News Battleground Tracker, collected by the survey research company YouGov, shines a bright light on undecided voters, typically too small a portion of any opinion poll to study reliably.
The battleground tracker pulled in data on more than 200,000 registered voters from around the country. Done in four waves, it provides powerful illustrations of how voters move into and out of undecided categories over the course of an election year. These movements reveal an interesting and familiar pattern about the choices that undecided voters eventually make: They’re predictable. CONT.
Lynn Vavreck (UCLA), New York Times