In two races, Democrats are increasing their leads. In another, the Democrat is chipping away at the Republican incumbent’s edge.

Democratic and Republican activists are asking voters to correct technical errors on their ballots in several close races that could determine control of the House.

About half of the yet-to-be-decided House races are in the state, which has only counted about three-quarters of its votes statewide.

What to KnowCompetitive House races remain undecided in Los Angeles, Orange, Riverside and San Bernardino counties. Two of six key races in Southern California had been called as of early Tuesday. Other races remained too close to call.

Tom Wait takes a look at some of the still closely contested races for the U.S. House of Representatives who will represent Southern California nearly a week after Election Day.

One week after Election Day, control of the U.S. House rests on just over a dozen races where winners have not yet been determined.