Isn’t even between a Republican and a Democrat. It will likely be between a Democrat and a Democrat. It’s California, where Kamala Harris and Linda Sanchez appear poised to finish 1-2 and go to a runoff.
Harris seems to be the favored candidate among progressives, but I think that Sanchez is probably going to be the one to win. There are more Latinos than African-Americans in California, so strictly on racial politics Sanchez has a huge advantage. Secondly, Sanchez is obviously the most conservative candidate, which means that Republican support should be almost monolithic in favor of her in the runoff.