Sen. Kamala Harris speaks to her supporters during her presidential campaign launch rally in January 2019. She exited the race in December. coalescing | Mason Trinca/Getty Images

Updated: 03/08/2020 09:07 AM EDT

Sen. Kamala Harris on Sunday threw her support behind former Vice President Joe Biden, adding to his campaign’s post-Super Tuesday surge.

In a video she shared on Twitter, the California senator — once the lone black woman in what was a diverse and large 2020 Democratic field — said she would do everything in her power to help elect Biden.

Having just arrived in Alabama to commemorate the 55th anniversary of Bloody Sunday in Selma, Harris said she was thinking about the generations of people who fought and died for civil rights and helped “our nation achieve its ideals.”

“We still have yet to achieve those ideals, but one of the greatest things about us is that we are willing to fight to get there,” she said. “So I just wanted you guys to know … I have decided that I am, with great enthusiasm, going to endorse Joe Biden.”

She called him a great leader, someone she’s known for a long time and a public servant she believes can unify the people. On Sunday, she joined the coalescing of moderates — including former 2020 rivals Pete Buttigieg, Beto O’Rourke and Amy Klobuchar — behind the former vice president.

“There is so much at stake in this election, guys, so join me in supporting Joe. Let’s get this done,” she said before announcing she would appear at Biden’s Detroit rally on Monday night.

The senator also sent out a statement in which she said Americans “deserve a president with the knowledge and experience to reassure a nation weary of tweets, lies and incompetence.”

Harris said of Biden: “You can see in his eyes how he takes to heart the experiences of mothers and fathers working to make ends meet and worrying about whether their children can be safe in their classroom, or young people who fight tirelessly to tackle climate change as they ask for a fair shot at the future in front of them. And with a lifetime in public service, Joe has a proven track record of getting things done.”

Harris, who suspended her presidential campaign in December, acknowledged the withdrawal of every woman from the race aside from Hawaii Rep. Tulsi Gabbard: “This is something we must reckon with, and it is something I will have more to say about in the future. But we must rise to unite the party and country behind a candidate who reflects the decency and dignity of the American people and who can ultimately defeat Donald Trump.”

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The senator also pointed to her close relationship with Biden’s son Beau, who died of brain cancer in 2015. Harris and Beau Biden served as fellow state attorneys general in California and Delaware, respectively. Joe Biden later endorsed her 2016 U.S. Senate run, and some Democrats have had their fingers crossed for a Biden-Harris 2020 ticket — even after her surprise attack on Biden’s stance of busing in the first Democratic debate.

On Sunday, the Biden team retweeted her post with a note: “Kamala — You’ve spent your whole career fighting for folks who’ve been written off and left behind — and no small part of that alongside Beau. From our family: thank you.”

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