RCP 2020 poll averages for Biden mimic almost EXACTLY the Clinton poll averages in 2016
https://www.realclearpolitics.com/epolls/2016/president/us/general_election_trump_vs_clinton-5491.html
https://www.realclearpolitics.com/epolls/2020/president/us/2020_democratic_presidential_nomination-6730.html