SAN FRANCISCO — Four of the five game changers that could flip control of the U.S. House have finally been called in California, though the ugliest fight between two Democratic rivals is still up in the air. 

Republicans now hold a three-seat majority in the lower chamber of Congress. Of the 16 House districts won by President Joe Biden in 2020 but are now in GOP hands, five are in California. And 10 of the 72 most competitive House races across the country are also in the state and involve several of the same districts in which races were won by razor-thin margins two years ago, according to the Cook Political Report.