The political preferences of U.S. religious groups

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If they are meaningless how do we explain that the final poll results for presidential elections are almost always withing the margin of error?

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https://fivethirtyeight.com/features/the-polls-are-all-right/

They aren't. And when they sometimes are, it could be for several reasons...

 

[Flash]

They aren't. And when they sometimes are, it could be for several reasons...

What was the reason the 2016 final poll results showed Hillary with a 2% lead which is the same as the actual results?