"We are more likely to believe that housing is a human right' than conservatives in Florida or Texas, but less likely to actually get people housed. We accept a yawning gulf between our values and our outcomes." ... . "Politics always is part theater, but out West too often we settle for being performative rather than substantive." ... . "For example, as a gesture to support trans kids, Oregon took money from the tight education budget to put tampons in boys' restrooms in elementary schools " including boys' restrooms in kindergartens." ... "One of the passions of the left, drawing partly on Ibram X. Kendi's book How to Be an Antiracist,' has been that if a policy leads to racial inequity, then it's racist even if it wasn't meant to be. But by that standard, West Coast progressivism abounds in racism." read more
She was selected to diversify the ticket, thus attracting voters from many demographics an old white dude doesn't draw. Are YOU suggesting that Kamala Harris only attracts Black voters? I didn't think so.
I would suggest it's the primary reason.
Sure it gave CA voters something to consider. But overall the calculation was she attracted Black voters.
You need to consider the context and timing of the selection, the US was going through BLM protest/unrest.