The Democrats greatest enemy is other Democrats. There is this dog-eat-dog mentality that they've adopted. If you don't check all the little social engineering boxes that they want, they'll turn on you in a heartbeat and smear you as "Alt-Right adjacent." They have underestimated how sick to death America is of political correctness.
Even I concur with that notion. And it is something Obama himself chimed in on in regards to 'cancel culture' and the incessant predilection of focusing on identity politics. The good news is I am seeing a paradigm shift in that regard. There seems to be a genuine pushback occurring and that manifested in the Democratic primary. I had honestly assumed Elizabeth Warren would be the nominee due to the focus to get a women elected president. But her performance in the debates and the lack of enthusiam around her seemed to seal her fate. The fixation on AOC also was beyond frustrating. I am sorry, but she is basically the Sarah Palin of the Democratic party. And placing her on an undeserved pedestal did the Democrats no favors.
But it appears clearer heads are now prevailing within the Democratic party. They ended up going with the 'safe' candidate in Biden and I am seeing less and less focus on AOC or other members of 'The Squad'.
Now the $64,000 dollar question is: who is the likely VP nominee? I think Sanders supporters would like to see him selected. But having two old men is likely not going to be the tactical solution.
Looking at the candidate pool, it is difficult for me to gauge who would be best suited in the VP role. I think some may push for Kamala Harris. Maybe not a bad option, but that could energize Trump's base because anyone coming from, ahem, 'Commiefornia' might end up having too much baggage. (No offense to the Californians on this forum)
I also liked Tulsi Gabbard and I think she might have made sense as a VP option. But like you indicated, the media decided to undermine her and that may have now made it non-viable for her to enter the fray.
I guess the one name that could be floated now is Cuomo. He has become pretty popular as a result of his response to Covid-19. He seems to have a fair amount of respect and doesn't appear too much on the fringe. And based on the sentiment of many Democrats feeling he should be the person running for president, if he is chosen as a VP option, that might tip the scales in the Democrats favor come November.