|Porter Katie Porter||Democrat Dem.||158,906||52.1%|
|Walters* Mimi Walters*||Republican Rep.||146,383||47.9%|
305,289 votes, 100% reporting (444 of 444 precincts)
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.