I heard a report from Britain last night that people were saying the pollsters were aggressive, and tugging at people to indicate a preference for “stay”, so people went along and said “Yep, fine, I’m for stay” and then went out and voted to LEAVE.
In the UK the “Bradley Effect” is the “Shy Tory Factor”
https://en.wikipedia.org/wiki/Shy_Tory_Factor
Give the pollster the PC answer and he/she goes away...:^)