Vermont is very liberal and anti-Trump, so it’s no surprise that Biden is currently polling around 30 points ahead of Trump.
Vermont has been blue in every presidential election since 1992, and usually by quite big margins. In 2016, Hillary Clinton’s margin was smaller than Democrats usually get in Vermont, because over 18,000 people voted for Bernie Sanders. While I understand their frustration with the primary process (I voted for Bernie in the 2016 primary, too!), this is not the time for a protest vote. Look at it this way, Vermont—you get to keep your beloved Senator!