This is a little complicated, so click the link, but here's part of it:
"If someone mistakenly says they voted for Biden in 2020 but had actually voted for Trump, and then says they plan to vote for Trump in 2024, it will look like there’s been a shift toward Trump when there actually hasn’t been.”
https://x.com/SimonWDC/status/1844887796235825372?t=ZTkQB94r6g74G_OiVWsyvQ&s=19
"Of last 15 general election polls released in PA, 12 have right/GOP affiliations.
Their campaign to game the polling averages and make it appear like Trump is winning - when he isn't - escalated in last few days."
https://politicalwire.com/2024/10/12/why-the-polls-might-be-underestimating-harris/
This is a little complicated, so click the link, but here's part of it:
"If someone mistakenly says they voted for Biden in 2020 but had actually voted for Trump, and then says they plan to vote for Trump in 2024, it will look like there’s been a shift toward Trump when there actually hasn’t been.”