Do some digging on Feinstein, George Moscone, Harvey Milk.
If you really want to see something interesting, go to https://en.wikipedia.org/wiki/List_of_assassinated_American_politicians and in the year column sort by year, pay particular attention to the 60's and 70's.
I suspect that some other player is involved other than just the two parties. Some "string" pullers trying to influence GLOBAL events to suit their own purposes. Playing both sides as it suits their particular needs. Looking at you Vatican and bankers.