Of course the north bay just noped out on anything like that.
https://farm6.staticflickr.com/5057/5423961825_2d5af7cef4_o....
"We don't want people from Richmond and Oakland being able to come into Marin!"
Well back then just like today, there is a distinct ethnic group this obviously refers to.
That was the primary argument against it - we don't want blacks in Marin (unless they are "house blacks" living in Marin City which used to 99% black in the 1970s - it's been gentrified a lot since then).
Even as a teen I knew exactly what they were really saying and I found it disgusting but it also made me aware of the fact that the most racist people are not Klansmen in white robes - it's progressive liberals and this was only my first experience with that. I've had plenty more since then over the decades.
Marin county is full of racists. It's a large part of why I'd never live there despite how I will partially inherit my mother's house there (it will be sold off instead). You can talk to black folks driving through Marin about how they get followed by the police and often get warned to get out of the county ASAP if they want to avoid trouble.
It's a large part of why I always lived on the east side of Silicon Valley (East SJ, Milpitas, Fremont, etc. where being "white" made me a minority) instead of the whiter west cities like PA, MV, SV, Cupertino, etc. You still hear to this day comments like I heard in Marin from people in these cities! We don't want "those people" from "over there" around here!
It's a large part of why I no longer live in California and have no intention of returning despite being a native born California with all my remaining family still in California.
Speaking of racism, I found out recently that my ex-landlord's grandfather was also a landlord in San Mateo, in the 1950s implemented racial exclusion deeds: https://www.nytimes.com/2020/08/14/opinion/sunday/blm-reside...
and as a coincidence, while looking that up, I found: https://www.foundsf.org/index.php?title=Bohannon%E2%80%99s_C...
which suggests he may have also opposed BART in San Mateo on racial grounds.