On Sunday, Sen. Kamala Harris, D-Calif., endorsed former Vice President Joe Biden for the Democratic nomination over Vermont Sen. Bernie Sanders.

“Joe Biden has served our country with dignity and we need him now more than ever. I will do everything in my power to help elect him the next President of the United States,” Harris tweeted.

In a video, Harris said she would be commemorating Bloody Sunday by walking across the Edmond Pettus Bridge in Alabama with Rep. John Lewis, D-Ga., then pivoted to her endorsement of Biden.

“I believe in Joe. I really believe in him and I have known him for a long time. One of the things that we need right now is we need a leader who really does care about the people and who can therefore unify the people. And I believe Joe can do that,” Harris said.

.@JoeBiden has served our country with dignity and we need him now more than ever. I will do everything in my power to help elect him the next President of the United States. pic.twitter.com/DbB2fGWpaa — Kamala Harris (@KamalaHarris) March 8, 2020

On the very first Democratic debate stage, Harris insinuated Biden was a racist for opposing forced busing. A policy that is, and always has been, wildly unpopular.

“Vice President Biden, I do not believe you are a racist,” Harris said. “I also believe — and it’s personal and it was hurtful to hear you talk about the reputations of two United States senators who built their reputations and career on the segregation of race in this country. It was not only that, but you also worked with them to oppose busing.”

WATCH: Harris says she doesn't think Biden is a racist, but she talks directly to Biden about his having worked with segregationists on the issue of school busing. #DemDebate2 pic.twitter.com/Ytb2xvOhux — NBC News (@NBCNews) June 28, 2019

Biden countered saying while Harris was working as a prosecutor, he was working as a public defender who fought for civil rights.

Harris is endorsing a man she saw as upholding racist politicians and policies just eight months ago. She is joined by Sen. Cory Booker, D-N.J., who said Biden will reignite America’s spirit.

“The answer to hatred and division is to reignite our spirit of common purpose. Joe Biden won’t only win, he’ll show there’s more that unites us than divides us. He’ll restore honor to the Oval Office and tackle our most pressing challenges. That’s why I’m proud to endorse Joe,” Booker tweeted.

The answer to hatred & division is to reignite our spirit of common purpose.@JoeBiden won’t only win – he’ll

show there's more that unites us than divides us. He’ll restore honor to the Oval Office and tackle our most pressing challenges. That’s why I’m proud to endorse Joe. pic.twitter.com/RcsnZs5mfQ — Cory Booker (@CoryBooker) March 9, 2020

In the aftermath of the September debate, Booker told CNN he saw Biden’s age as a concern.

“There’s a lot of people concerned about Joe Biden’s ability to carry the ball all the way across the end line without fumbling,” Booker said.