"Large numbers of surveys would be expected to show a wider variety of opinion, even in a close election, due to the randomness inherent in polling. The absence of such variation suggests that either pollsters are adjusting “weird” margins of 5% or more, Clinton and Lapinski argued – or the following second possibility, which they deemed more likely.

“Some of the tools pollsters are using in 2024 to address the polling problems of 2020, such as weighting by partisanship, past vote or other factors, may be flattening out the differences and reducing the variation in reported poll results,” they write." https://www.theguardian.com/us-news/2024/nov/02/what-polls-mean-so-far-trump-harris-election-voters