The margin of error is due to the small sample size.
When the candidates are more than that much apart, the poll is essentially meaningless.
Averaging uncertainty gives more uncertainty, not better numbers.
What matters is how many normal people get out and vote.
It also depends on how many abnormal people get out and vote too. And how many illegals. And how many "rise from the dead". You know, there's lots of tricks and the dems know them all.