https://upload.wikimedia.org/wikipedia/commons/thumb/d/da/2016_Presidential_Election_by_County.svg/474px-2016_Presidential_Election_by_County.svg.png


And one only needs to look at all the constituencies HRC had on lock against 45, when she STILL LOST...

https://en.wikipedia.org/wiki/2016_United_States_presidential_election#Voter_demographics

even with more votes, higher turnout among youth voters (https://www.pewresearch.org/fact-tank/2017/07/31/gen-zers-millennials-and-gen-xers-outvoted-boomers-and-older-generations-in-2016-election/ft_19-05-02_generationsvoteupdate_1/) etc.

Dems need to flip some damn Obama-Trump counties. A running mate that can balance Biden's weak areas, bring funding and a well-organized coaliation of supporters and volunteers with them, and demonstrated strength in those communities is the strategy imho; these counties are mostly rural and suburban and in some states dont even have inconquerable margins eg. MI/WI.