Favorability for the party nominees on election day 2016, per RCP averages:

Trump: -21%
Clinton: -13%

Favorability now:

Trump: -9%
Biden: -1%

Both candidates start the general with lower negatives than last time, but Biden being basically 50-50 explains why he keeps leading.

— David Weigel (@daveweigel) April 9, 2020