Is there any reason for me to believe the polls when they showed him losing Michigan Wisconsin Pennsylvania and doing worse in Minnesota Ohio Maine North Carolina Virginia Colorado Iowa ?
Pollsters regularly change their methodology, and polling biases change from cycle to cycle. While some states like Nevada and Michigan have notoriously bad polling, there isn't much reason to believe that polls will necessarily be biased against Trump in the future. I'd say it's just as likely that 2020 polls end up having a slight pro-Trump bias as it is that they underestimate Trump again.
