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.

Nine states have at least one uncalled House race, some of which are so close they are headed to a recount. Then there’s California. 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.

The same was true four years ago, when Florida reported the results of nearly 99% of ballots cast within a few hours of polls closing. In California, almost one-third of ballots were uncounted after election night,

Several of the yet-to-be-decided House races are in California, which had only counted about three-quarters of its votes statewide as of Tuesday.