Nathaniel Rakich: “There are already a lot of things that a smart poll-watcher has to account for when comparing surveys. Were they done by the same pollster? Did they query the same type of population (likely voters, registered voters, all adults)? To this list, the volatile 2020 Democratic primary field has added one more: Do they ask about the same candidates?”
“With upwards of 20 candidates and potential candidates, pollsters are forced to make editorial decisions about whom to ask about. And with new candidates still popping up out of nowhere, the field is enough in flux that it looks different every month.”
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