NYT admits partisan non-response is source for Trump's lead in poll

[Ms. Toad]

34. I don't think you understood what you read.

It is standard to adjust polls to account for over/under responses by mathematically reducing the responses by the over-responding party (as they did in this case). All polls are going to have a disproportionate response - that's why one of the standard questions is party affiliation or, if none, which party do you favor more. The purpose of that question is to be able to "exclude the excess Republican responses" by mathematically adjusting number of republican votes in the poll.

But what this standard statistical adjustment cannot take into account is a motivation skew within the Democrats and Independents: If Democrats and Independents who intend to vote for Biden chose not to respond - and those who intend to vote for Trump chose to respond, it would look like Trump has more support because of the disproportionate Trump responses within the Democrats and Independents. No adjustment of the Republican responders would fix that skew.