Republican Martha McSally conceded to Democrat Kyrsten Sinema on Monday.
McSally made the announcement in a video posted to Twitter. She becomes the state's first female USA senator.
The race between Sinema and McSally was one of the most closely watched in the nation. Sinema was declared the victor Monday as her lead grew insurmountable during Arizona's lengthy vote-count, The Associated Press reports.
Sinema declared victory in her race against Republican Martha McSally Monday night.
Sinema's House record ranks her among the most centrist Democrats - but McSally seized on her rival's past as an anti-war activist, airing a television advertisement featuring Sinema protesting in a pink tutu. Her win cemented Arizona as a swing state after years of Republican dominance.
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Sinema, meanwhile, criticized McSally's vote to repeal the Affordable Care Act and kept her distance from national Democrats. The win brings the Senate totals in the next session of Congress to 53 Republicans and 47 Democrats, assuming Florida GOP Gov. Rick Scott wins the recount for his race against Democratic Sen.
When the 9th Congressional District was created after the 2010 Census, Sinema ran for the Phoenix-area seat as a centrist and won the 2012 election. Ducey campaigned with McSally often last month. She said she would try to follow his example and "put country before party".
Ms Sinema started out in politics as a liberal activist and spokeswoman for the Green Party. One of her political mentors, Jon Kyl, was appointed in September to fill John McCain's seat after Arizona's senior senator died following a struggle against brain cancer. She will be the first openly bisexual senator in history, as well as the first woman to ever serve as a senator from Arizona. McSally is a retired Air Force colonel and was the first female fighter pilot to fly in combat.
Attempting to prove her conservative bona fides during a primary fight with former state Sen.
Flake was an outspoken critic of Trump and announced in 2017 that he would not seek re-election, acknowledging he could not win a GOP primary in the current political climate.