And perhaps nowhere are they more confident than in Representative Steve Knight’s seat, one of the few bastions of conservatism in Los Angeles County.
Younger, more left-leaning families who were priced out of the housing market closer to the city of Los Angeles have moved into the district, diversifying the population, which is now nearly 40 percent Latino.
“This is the Democratic stronghold,” said Bryan Caforio, one of the leading Democratic candidates in the race. “There are more Democrats in the Antelope Valley than anywhere else.”
Not everyone agrees that the Democrats are in such a strong position. Patricia Garcia, 49, a registered Republican from Simi Valley, said she was not happy with how blue California had become. “It’s becoming a little bit too liberal for us,” she said. “We see California moving too far to the left.”
Well to the north, in the state’s Central Valley, Representative Jeff Denham is another Republican facing a threat in a district carried by Mrs. Clinton.
And Jerry Kinkey, 71, is precisely the type of voter that Democrats are counting on this year.
In the driveway of his home in Tracy, Mr. Kinkey, a registered Republican and a Vietnam veteran, said he had flipped in this election. He voted by mail last week.
He dropped his support of Mr. Denham because of the lawmaker’s vote to repeal the Affordable Care Act. The top Democratic contenders to unseat him include Josh Harder, a former technology venture capitalist; Virginia Madueño, the former mayor of the small city of Riverbank; and Sue Zwahlen, an emergency room nurse.
So which Democrat did Mr. Kinkey pick?
There were so many names on the ballot, he can’t remember. “I had to wing it,” he said