You are exactly correct: millions of people voted for the Biden they saw in his ads and commentary about him on the Marxist media and voted against the dishonest caricature of President Trump that the same Marxist media painted. They have no idea about Biden the man or Trump the man as they are today, or even mostly about their policies.
https://www.supremecourt.gov/opinions/16pdf/15-5991_8m59.pdf
https://www.law.cornell.edu/supremecourt/text/98/61