So I've put together a map of what I would say is a pessimistic outlook for Biden. All my data is taken from 538.
All states even leaning towards trump I have given him including Ohio, Texas and Iowa which are by no means a cert for him but he is expected to win nonetheless. All the brown states are states where Biden leads but does not have a 90% win chance according to 538. Essentially Biden needs 22 points from the 103 where he has a lead but his lead is not certain.
Essentially what you want to take away from this post is to watch the following states like a hawk on election night:
* Nevada (6)
* Arizona (11)
* New Hampshire (4)
* Pennsylvania (20)
* North Carolina (15)
* Georgia (16)
* Florida (29)
* Maine District 2 (1)
* Nebraska District 2 (1)
Also keep an eye on Texas (38), Ohio (18) and Iowa (6). If Biden can take 22 points from the above he will win the presidency assuming he carries all states where he is above 90% likelihood to win.
There are a considerable number of combinations for Biden to hit the magic 270 mark assuming he holds his very likely states.