It actually does. But that's fine.
And yes, its because Biden is tripling clinton's support from those 3 states/cities. That's it. Clinton obviously dominated those places in 2016.
Totally dominating a concentrated demographic does not change the EC, does not change the Senate and does not change the House. There has to be a more widespread appeal to a broader group of people to change power significantly
Now if minorities turn out for Biden in 2020 like they did for Obama in 2012 and give him that huge 90% + majority, then Detroit & Philadelphia can change the EC. Still doesn't move the needle in the House.
There's no reason to believe they're enthusiastic about Biden, no matter what CNN and their democratic allies tell you
As I stated down in the poly forum, there's absolutely no way the pollsters can accurately poll 2020. There's no precedent for all the bullshit and violence and finger pointing and anger