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The fundamental mathematical tenet on which all polling is based is the selection of a random sample. If a sample is random then the results should be relatively accurate within the MoE. One possibility why in the past two major polling efforts for the general election, has been a failure, is the possibility political polarization has skewed the sampling, and thus inherently introduced bias or or to say another way, inaccurate results.
When the mathematics fail ... I use my spidey sense
ignorance is the enemy without equality there is no liberty America can survive bad policy, but not destruction of our Democratic institutions