Democrats flip Arizona US Senate seat with Sinema victory. Democratic Rep. Kyrsten Sinema will win Arizona's US Senate race, defeating Republican Rep. Martha McSally and flipping a seat that had been in GOP hands for 24 years.
McSally conceded the race on Monday night -- six days after the election -- as county-by-county tallies of mailed-in ballots continued to increase Sinema's lead.
"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 in a video posted on Twitter Monday night. Ref. CNN.