True but what the poster said is important: polls do not work well in close races because they don’t sample correctly.

That’s not my point. My point is that the poll movements are almost always correct, because pollsters are at least consistent with how biased they are / errors in sampling.

Fox News had Trump leading Biden a few weeks ago. Today, Biden is ahead of Trump. We don’t know where the “truth” lies, but we can 100% conclude that the typical American has lost a bit of favor on Trump in the past few weeks.