Democrat Matt Heinz just told the remaining Democrats at the Marriott Election Night gathering that he called Congresswoman Martha McSally to concede the race.
"This has been a very interesting night," Heinz told the crowd.
As of the most recent count, McSally was leading with 54 percent of the vote.
Heinz said he hoped that Trump wouldn't win the White House, but if the GOP does hold the White House and Congress, "I know we're going to get through this because America always does."
Meanwhile, Democrat Tom O'Halleran's chances of victory look good, but he has stopped short of declaring victory of Republican Paul Babeu in Congressional District 1.
"Tonight demonstrated that Tom's message of bringing people together to solve problems has resonated with voters across Arizona's First Congressional District," said O'Halleran campaign manager Jacob Becklund. "We are confident that when all the votes are counted Tom's message will have prevailed."