Steve Hilton, a Republican endorsed by President Trump, will face Xavier Becerra, a Democrat, in the general election. Tom Steyer, another Democrat, will not advance.

© Gabriela Bhaskar/The New York Times

Mai Vang, a progressive member of the Sacramento City Council, will challenge Ms. Matsui, the 81-year-old incumbent, in the general election.

© Mike Kai Chen for The New York Times

Experts say speeding up the count in California would take more resources, but also scaling back rules that expand voting access.

© Jae C. Hong/Associated Press