Poll data is always limited. Yougov was very accurate in 2016. Ras got the same result but got lucky.
Because it is possible that in some cases (but not in others) that the block of people not answering their phone forms a uniform voting factor.
If it were just a small group of people, this wouldn’t matter. But its not a small group of people anymore.
It’s now like trying to predict the temperature a bathtub will have when it fills while being unaware that three of the buckets being poured in are full of ice.
Oh they are?
Yes, why didn’t you check?
They wouldn’t talk to me.