[muawiyah]

Whenever an adjustment is made to any poll that's been based on random sampling of the population, or segment of the population, it's no longer reflective of the current state of that population or segment.

The second the database behind a preference poll is adjusted, it no longer has enough validity to bother with.

[JediJones]

The problem is the sampling is never truly random to begin with. As Morris wrote, the phone polling always picks up too many older people and other groups. So not adjusting would leave worse results. If you could do a truly random poll, that wouldn’t need adjusting, and you wouldn’t get margins of error.