Midterm election results updates: Dems keep control of Senate with Nevada win

Democratic Nevada Gov. Steve Sisolak conceded in his bid for reelection Friday against Republican challenger Joe Lombardo.

"While votes are still coming in -- and we need every ballot tallied and every voice heard -- it appears we will fall a percentage point or so short of winning," Sisolak said in a statement. "Obviously that is not the outcome I want, but I believe in our election system, in democracy and honoring the will of Nevada voters."

Sisolak's concession came moments before ABC News projected that Lombardo, a Trump-backed former Clark County sheriff, will win the close race.

Republican Oregon gubernatorial candidate Christine Drazan officially conceded the race to Democrat Tina Kotek on Friday.

"It was a hard-fought battle, and this is not the outcome that we hoped for. But I am grateful to have been a part of this process," Drazan said in a video message.

The concession comes as ABC News projected that Kotek will win the close race.

Kotek already declared victory on Thursday, after The Oregonian projected she will win the race.

"It's time to start work. There’s an urgency from voters and we are moving forward," she said at a press conference.

Kotek will become one of the first openly gay governors in U.S. history, alongside Massachusetts governor-elect Maura Healey.

There are about 50,030 mail ballots that still need to be counted in Nevada's most-populous and most Democratic-leaning county, Clark County Registrar of Voters Joe Gloria told reporters Friday.

Nearly 16,000 ballots will be sent to tabulation today, Gloria said.

“We're getting to the tail end of what we need to do,” he said. “The tabulation team stays pretty consistent because that's the fastest of all the groups. They can read, if they have to, about 1,000 ballots an hour.”

Saturday is the last day for mail ballots to be received and elections officials will be doing two trips to make sure none are left behind. The deadline to finish counting mail-in ballots is Tuesday, Nov. 15.

Democratic incumbent Catherine Cortez Masto and her Republican challenger, Adam Laxalt, are locked in a tight race for the U.S. Senate. As of Friday afternoon, Laxalt had a lead of roughly 9,000 votes.

-ABC News' Abby Cruz

There are a little more than 500,000 votes left to be counted in Arizona, according to the secretary of state's office.

Officials in Maricopa County -- the state's largest -- expect to "probably" be done with their count on Monday.

Two closely watched races have yet to be decided: the Senate contest between Democratic incumbent Mark Kelly and Republican challenger Blake Masters, as well as the gubernatorial race between Democrat Katie Hobbs and Republican Kari Lake.

Some Republicans are angry that results still aren't in, but officials stressed that this is how the process set by the legislature works and that accuracy is more important than speed.

Races that fall within one-half of a percentage point or less will trigger an automatic recount.

-ABC News’ Libby Cathey