Lungren's race could drag on for weeks as Sacramento County election officials count the 162,000 vote by mail and 31,000 provisional ballots still outstanding. The 193,000 votes being counted in Sacramento County were cast in one of four congressional districts.
County election officials in California must submit final official results to the Secretary of State by December 7.
California has been an uphill battle for Republicans after redistricting moved reliably Republican seats like Bono Mack's into more Democratic territory.
Two races in Arizona also also remain uncalled.
The contest for former Rep. Gabrielle Giffords' seat between Barber and McSally finds Barber behind by 426 votes. Barber, former district director for Giffords, replaced her in a special election held after she was shot in the head and severely wounded in 2011.
The man convicted in the attack outside a supermarket that killed six people received a life prison sentence on Thursday.
And in a district across the state, Democrat Kyrsten Sinema is holding onto an almost 3,000-vote lead over Republican Vernon Parker while provisional and absentee votes are counted.
Parker might have Libertarian candidate Powell Gammill to blame if he does not win. Gammill won more than 6% of the vote in Tuesday's election despite urging supporters to stay home rather than vote on Election Day in protest of the political system.
The unresolved contest in North Carolina could be the second tightest 2012 congressional race after provisional and absentee ballots are counted for the district that encompasses Wilmington and northwest to the Raleigh suburbs.
Democratic Rep. Mike McIntyre faced a tough re-election challenge in a district that added Johnston County to McIntyre's and his hometown of Lumberton was cut from the 7th District this year after his seat, too, was redistricted.
Once the ballots are counted, either McIntyre or his Republican challenger and two-term state Sen. David Rouzer can request a recount if the margin remains a 1% or less. Both candidates have until November 20 to request a recount.
Gary Bartlett, the executive director for the State Board of Elections in North Carolina, said officials should know if Rouzer intends to request a recount before the November 20 deadline.