Rep. Martha McSally (R., Ariz.) conceded to Democratic opponent Rep. Kyrsten Sinema (D., Ariz.) on Monday evening after after a slow vote count dragged on for nearly a week after voters cast their ballots last Tuesday.

Sinema's victory gives the Democrats two pick-ups in the 2018 midterms, as the race was for the spot being vacated by Republican Sen. Jeff Flake. Democratic Rep. Jacky Rosen (D., Nev.) also beat Sen. Dean Heller (R., Nev.) in Nevada.

McSally, the first woman in U.S. history to fly a fighter jet in combat, conceded defeat to Sinema, a third-term congresswoman and former social worker, making her the first female senator in Arizona, according to the New York Times:

The win by Ms. Sinema points to a remarkable shift in Arizona’s political landscape. That state has been a Republican bastion for decades, but Democrats are seizing on dissatisfaction with budget cuts and growing unease over the Trump administration’s immigration crackdown to make inroads with moderate voters. Voter drives to register more Latinos, who generally vote Democratic in Arizona, appear to have paid off for Ms. Sinema. About 2.1 million Latinos live in Arizona, about a third of the state’s population; while Mr. Trump narrowly carried the state in the 2016 election, many Latinos in the state have expressed displeasure with the president. "I have never been into politics until this year," said Oralia Ochoa, 26, a first-time voter who cast her ballot for Ms. Sinema and other Democrats. "It all has to do with Trump and what’s going on." Ms. Sinema started out in politics as a liberal activist and spokeswoman for the Green Party. She shifted to the center after winning a seat in 2012 in the House of Representatives, drawing criticism from some on the left for siding with Mr. Trump and other Republicans on some legislation.

Shortly after McSally called Sinema to concede and congratulate her, she posted a video on Twitter with her dog announcing her setback.

"Congrats to @kyrstensinema. I wish her success. I’m grateful to all those who supported me in this journey. I’m inspired by Arizonans’ spirit and our state’s best days are ahead of us," the tweet read.

Congrats to @kyrstensinema. I wish her success. I’m grateful to all those who supported me in this journey. I’m inspired by Arizonans’ spirit and our state’s best days are ahead of us. pic.twitter.com/tw0uKgi3oO — McSally For Senate (@MarthaMcSally) November 13, 2018

"Hey everybody, I just called Kyrsten Sinema and congratulated her on becoming Arizona's first female senator after a hard-fought battle. I wish her all success as she represents Arizona in the Senate," McSally said. "And I also want to say thank you to everybody who supported me in this campaign, my staff and volunteers and everybody who voted for me."

"I'm so grateful for you as my wingmen and wingwomen in this journey. We sure wish it came out with a different result, but I'm so thankful for you. As I traveled around this state I was so inspired by the many people that I met and I am convinced that Arizona is the best state in the country and our best days are still yet to come and I'm going to continue to pray for our success," McSally concluded.

Flake will leave the U.S. Senate after one term. He has been a frequent critic of President Donald Trump and questioned the direction of conservatism and the Republican Party under his leadership.