I was about to point out that your use of "oversampling" didn't refer to the standard statistical technique, but rather to the right-wing conspiracy theory about polling being intentionally altered, but you've pretty much made that clear with your reply.

I think this first became a "thing" back in 2012, when the polls were predicting Obama to beat Romney, and that just didn't seem like it could be true, and it was blamed on "oversampling".

Also, Nate Silver isn't a pollster, he just uses their output as input to his models.