The same reason the polls were so far off leading into the 2016 election. People who were going to vote for Trump weren’t admitting it publicly, for fear of backlash. There were videos of people leaving a rally or with a bumper sticker who were having rocks thrown at them and their car surrounded. If people are going to act like that, other people who disagree are going to lie for their own protection, which makes polls meaningless.
The same reason the polls were so far off leading into the 2016 election. People who were going to vote for Trump weren’t admitting it publicly, for fear of backlash. There were videos of people leaving a rally or with a bumper sticker who were having rocks thrown at them and their car surrounded. If people are going to act like that, other people who disagree are going to lie for their own protection, which makes polls meaningless.