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Quiscalus mexicanus
As I researched it some more, it looks like there is a Great-tailed grackle which is found in California, Texas and even down through South America. It was once thought to be the same species as the Boat-tailed Grackle.
looks like a female grackle. Possibly boat tailed grackle but I'm not sure. They are prominent in Florida but I noticed you found these in California.