
Methodology:
The tracker will be updated daily. The Cook Political Report average includes 12 more traditional national polls that incorporate live interviews (ABC News/Wash Post, CNBC, CNN, FOX News, Gallup, Marquette Law School, NBC News, NPR/PBS/Marist, NYTimes/Siena, Quinnipiac, Suffolk/USA Today and Wall Street Journal) and nine online/large panel polls (ABC News/Ipsos, CBS News, Economist/YouGov, Harvard/Harris, Morning Consult, Pew Research Center, Reuters/Ipsos, SurveyUSA and Yahoo News).
To be included in our national polling average, a poll must:
- Meet basic transparency standards of publishing sample size and survey methodology.
- Be conducted partially or entirely in the past 60 days. Polls are weighted by recency (for example, a poll that came out of the field a day ago counts roughly twice as much as a poll that came out of the field a month ago).
- Include results among all Americans, registered voters, or likely voters. As the cycle continues and pollsters begin to employ registered and likely voter models, we will default to the highest level of specificity; early in the cycle, we will default to surveys of adults when surveys of registered/likely voters are not available.
Because online pollsters tend to survey voters more frequently than live-interview pollsters (including some that survey voters on a rolling basis), we only include the single most recent result of each online pollster to prevent one pollster from dominating the average. Multiple surveys conducted by the same live-interview pollster may be included, provided they were all conducted in the last 60 days.
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Our subscribers have first access to individual race pages for each House, Senate and Governors race, which will include race ratings (each race is rated on a seven-point scale) and a narrative analysis pertaining to that race.