How Trump has trumped the Exit and other Analsysis
https://edition.cnn.com/2020/11/04/politics/donald-trump-2020-election-polling/index.html
Trump's overperformance of his poll numbers almost everywhere -- not to mention the likelihood that Republicans maintain control of the Senate and gain seats in the House (although fall short of winning the majority) -- are simply not explainable by the available polling data going into the election. They're just not.
And this isn't the first time we've seen this happen. In 2016, most polling -- not to mention the professional handicapping types -- suggested that Hillary Clinton was on her way to a comfortable, if not crushing, victory. That obviously didn't happen.