LGBTQ groups are cheering the Monday night victory by Arizona Rep. Kyrsten Sinema (D), who is set to become the country's first openly bisexual senator.

Sinema's win was officially declared on Monday after six days of ballot-counting in a tight senatorial race against GOP Rep. Martha McSally Martha Elizabeth McSallyThe Hill's Campaign Report: Presidential polls tighten weeks out from Election Day Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' New ABC/WaPost poll finds Trump edging Biden in Arizona, Florida MORE (Ariz.). Sinema will be the state's first female senator and the first Democrat to win a Senate race in Arizona since 1988.

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Sinema is also the second openly LGBTQ person to be elected to the upper chamber, joining Sen. Tammy Baldwin Tammy Suzanne BaldwinSenators introduce bipartisan bill to mandate digital apps disclose country of origin Keep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser MORE (D-Wis.), who is lesbian.

“An LGBTQ woman winning a U.S. Senate seat in a state that voted for Trump is a game-changer, both for the LGBTQ community and the Democratic party,” CEO and President of LGBTQ Victory Fund Annise Parker said in a statement on Monday. “Kyrsten’s victory makes clear that an LGBTQ candidate who listens to voters and prioritizes their issues can win elected office anywhere – blue state or red state."

Victory Fund, a political action committee that works to elect LGBTQ candidates to office, dubbed Sinema one of their "game changer" candidates this election cycle, directly contributing $10,000 to her campaign and raising more than $97,000 for her.

The country's largest LGBTQ advocacy organization, Human Rights Campaign (HRC), also in a statement called Sinema's win "historic."

HRC has invested heavily in the Arizona Senate race, with 18 staff members on the ground and thousands of volunteers nationwide seeking to bolster Sinema's campaign.

"Arizona voters rejected [President] Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and [Vice President] Mike Pence Michael (Mike) Richard PenceThe Hill's 12:30 Report: Ginsburg lies in repose Buttigieg stands in as Pence for Harris's debate practice Trump argues full Supreme Court needed to settle potential election disputes MORE’s politics of bigotry and fear and made history by electing bold pro-equality champion Kyrsten Sinema as the nation’s first openly bisexual U.S. Senator,” HRC President Chad Griffin said in a statement.

The Arizona Democrat was also the first openly bisexual member of the House of Representatives, co-chairing of the chamber’s Equality Caucus and co-sponsoring the Equality Act, federal legislation that would guarantee protections for LGBTQ people.

Sinema is a moderate Blue Dog Democrat who touted her centrist positions throughout her campaign.

Baldwin congratulated Sinema, as did others working in the LGBTQ community on Monday.

Very happy to say I’m no longer the *only* openly LGBTQ U.S. Senator.



Congratulations to @kyrstensinema on a well-deserved victory. The upper chamber is lucky to have your steady leadership. — Tammy Baldwin (@tammybaldwin) November 12, 2018

Thank you, @npr, for noting why Sinema's win is groundbreaking. https://t.co/ICTqMi0G0C — Still Bisexual (@StillBisexual) November 12, 2018

Today is a great day to be GAYYYYYYYYYY‍♂️‍♂️ https://t.co/Ul7KXdMFQZ — Lucas Acosta (@LucasRAcosta) November 12, 2018

Arizona made history by electing pro-equality champion @KyrstenSinema as the nation’s first openly bisexual US senator.



Thanks to @HRC volunteers who put in long hours to help #TurnOUT #EqualityVoters & make Kyrsten Sinema's historic win possible. #AZSen https://t.co/KqfiweJlOl pic.twitter.com/Dx0xS3StMu — HRC in Arizona (@HRCaz) November 12, 2018

Sinema says she has "always been out," but made her first public comment about bisexuality as an elected official in 2005, according to Elle Magazine.

"We're simply people like everyone else who want and deserve respect," Sinema said, responding to an anti-LGBTQ speech by a Republican lawmaker.

Reporters later asked her about her use of the first person.

"Duh, I'm bisexual," she replied.

Some analysts have said there was a "rainbow wave" during this year's midterm elections, with a record number of LGBTQ candidates running and winning up and down the ballot.

Democratic Rep. Jared Polis Jared Schutz PolisMore than 1,000 gather at Colorado racetrack to protest governor's coronavirus orders Over 300 LGBT leaders endorse Biden for president : 'The most pro-equality ticket in US history' Colorado GOP lawmaker, Michelle Malkin sue governor over coronavirus orders MORE on Election Day became the first openly gay man to win a gubernatorial race in Colorado.

— Updated 10 p.m.