How can Fox have a national poll that only samples 1000 people?

They call till they can get data from 1000 people.

1000 people is enough. It’s that they over sample Dems and undersample Republicans

1000 is not the problem. The problem is that it uses registered voters rather than the more accurate likely voters. Merely using registered voters usually favors democrat candidates.

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Lies and damn lies...

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Nice reference.

The posters always give themselves plausible deniability by stating, "as the race stands now" but the people reporting on the poll promote the illusion that this poll forecasts the result of election day.

In other words, the poll's only purpose is to provide subject matter for pundits and media personalities to talk about.

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1000 people is enough. It’s that they over sample Dems and undersample Republicans

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This, and it was a national poll of registered, not likely voters.

Kushner was on Fox saying almost all these polls are bullshite because they greatly undersample Republicans. Some as low as 24%

Has to do with sample size and margin of error.
There comes a point where you reach a saturation level, and more poll respondents don’t change the outcome.

You don't need a whole lot of precision at this time and point of the election, as long as your sample size is accurate and representative (which it may not be in this case.)

1,000 voters yields an error of plus-or-minus 3 percent, which is reasonable for August. It can't tell you if one candidate is ahead by a razor margin, but it can tell you if one candidate is comfortably ahead.