On
10/22 2016 vs. 2020 (from 538) . . .
FL: Hillary 49.2-45.5 (+3.7) | Biden 49.2-46.3 (+2.9)
PA: Hillary 50.4-43.3 (+7.1) | Biden 50.6-44.3 (+6.3)
OH: Hillary 47.2-45.7 (+1.5) | Biden 46.6-47.4 (-0.8)
MI: Hillary 50.3-41.5 (+8.8) | Biden 50.8-42.7 (+8.1)
WI: Hillary 50.2-42.5 (+7.7) | Biden 50.5-43.9 (+6.6)
MN: Hillary 50.3-42.7 (+7.6) | Biden 50.1-42.1 (+8.0)
NC: Hillary 48.6-45.9 (+2.7) | Biden 49.2-46.3 (+2.9)
IA: Hillary 46.3-45.6 (+0.7) | Biden 47.5-46.5 (+1.0)
AZ: Hillary 46.4-45.7 (+0.7) | Biden 48.8-45.3 (+3.5)
NV: Hillary 48.1-44.3 (+3.8) | Biden 50.0-43.5 (+6.5)
CO: Hillary 48.9-41.5 (+7.4) | Biden 52.7-39.7 (+13.0)
GA: Hillary 48.7-45.7 (+3.0) | Biden 47.5-46.6 (+0.9)
TX: Hillary 43.8-49.6 (-5.8) | Biden 47.2-47.8 (-0.6)
NH: Hillary 49.7-41.2 (+8.5) | Biden 53.7-42.2 (+11.5)
By comparison, Biden might actually be polling slightly worse than Hillary did at this point in a lot of swing states. He might be doing better nationally than Hillary was, but those extra votes may be coming from states Biden is way ahead in (and won't really matter) or states that he is polling better than Hillary did (yet still is going to lose).
The other thing I seemed to notice is that this cycle there haven't been many states that went back and forth across the last year. Most states have been pretty consistent, while with Hillary, both candidates seemed to lead in some stated at different points in time and their chances of winning that state spanned all over the map.