it's a "healthy" mix
unfortunately it's not policy driven. it's all identity and label-driven
"he's not a democrat"
"he's too old"
"he screwed over hillary
EDIT:
and of course, "No more white men! We need people of color above all else!"
Which is cool to have blacks, hispanics etc, but WHAT ARE THEIR POLICIES?! THat's the NUMBER 1 thing in politics is policy, so i dont care about the gender or race of a politician if his policies are top-notch
Unfortunately the democratic party has b*stardized identity politics to the point where they turn off many voters and cause them to leave. This is why 9% of democratic voters left and voted for trump in 2016 (this among MANY other things). Making the '16 election about electing a woman to show how "progressive" you are now (even though the woman in question wasn't progressive) seemed like the only goal.
It seems like dems are doing it again by trying to push Kamala harris down our throats so early. It just seems like a recipe for disaster. Once again, the woman in question isn't a progressive