A lot things went wrong in 2020. And presidential polls were no exception. Joe Biden was supposed to win the 2020 presidential by eight points, according to the polls, which were wrong. He won by five points. He was supposed to win Wisconsin by 10 points. Instead, Biden eked out a victory there with less than 1 percent of the vote between him and incumbent President Donald Trump. The polls were very wrong in Wisconsin. The polls also had Biden winning Florida. And North Carolina. Here’s why the polls ended up missing the mark in 2020, and what’s being done about it.