"The question for Democrats in these races is whether the nastiness of the primaries will weaken the party’s efforts in the general election — especially in an area where every ounce of Democratic energy is needed.
Orange County is traditionally Republican territory. Hillary Clinton was the first Democratic presidential nominee to win the county since Franklin D. Roosevelt in 1936. But while voters backed Clinton, they also supported area GOP lawmakers in 2016. While Democrats say this part of Southern California is shifting away from its Republican past, they acknowledge that hard work is ahead for the candidates trying to flip some of these seats."
From Roll Call, 5/24/18