California Election Results

In a district east of San Jose that takes in a mixture of conservative farming communities and liberal cities, the Republican incumbent, Representative Jeff Denham, is fighting for political survival against a Democratic newcomer to politics, Josh Harder, a former venture capitalist.

This district north of Los Angeles shows promise for Democrats, even though it has sent Republicans to Congress since 1993; the district favored Hillary Clinton in 2016. The Republican incumbent, Representative Steve Knight, is a former police officer and state legislator who has sought a somewhat softer line on immigration than his party has; his Democratic opponent, Katie Hill, is an executive at a nonprofit group that helps the homeless.

The longtime Republican incumbent, Representative Ed Royce, is retiring, and the race to replace him is close in a district that includes parts of Los Angeles, Orange and San Bernardino Counties. Gil Cisneros, a Navy veteran and lottery winner, is the Democratic candidate; the Republicans are backing Young Kim, a South Korean immigrant who was an aide to Mr. Royce.

Orange County used to mean Republican, but after an influx of Asian and Latino voters, it is becoming more purple. The two-term Republican incumbent in this district, Representative Mimi Walters, is a former investment banker; she is in a tight race with the Democratic challenger, Katie Porter, a liberal consumer protection lawyer and college professor who is a protégée of Senator Elizabeth Warren of Massachusetts.

Representative Dana Rohrabacher, the Republican incumbent, is known for outrageous statements, pro-Russia views and solid support for President Trump; his deeply Republican district has re-elected him for three decades. But Democrats see him as the most vulnerable Republican in the state, and he is in a tossup contest with Harley Rouda, a real estate executive and former Republican who switched parties. “President Trump has changed everything,” Mr. Rouda has said.

In one of the roughest races in the state, the Republican incumbent, Representative Duncan Hunter, was indicted over the summer on charges of abusing campaign funds. Before that, his Democratic opponent, Ammar Campa-Najjar, the son of an Arab father and a Mexican-American mother, was considered a long shot.