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Democratic presidential hopeful Joe Biden has picked up another prize endorsement from a former rival, Cory Booker. Biden and Bernie Sanders are vying to be the Democratic nominee who will face Donald Trump in November. Harris, who was the only black woman in the Democratic field before she ended her campaign in December, endorsed Biden on Sunday. The California senator's thumbs-up has ignited speculation about whether Mr Biden might select her as a running mate if he wins the Democratic presidential nomination. Both Ms Harris and Mr Booker, who is also African American, are expected to appear alongside Mr Biden at a rally in Detroit, Michigan, on Monday night. Booker will also reportedly campaign with Mr Biden in Flint, Michigan, earlier in the day. In an email, Booker - who dropped out of the race in January - said: "Joe is building the kind of campaign that will do more than remove one guy from one office. 

"He will lead the Democratic Party to victory in races up and down the ballot across the country this November."

A week ago, three other former Biden rivals - Senator Amy Klobuchar of Minnesota, Pete Buttigieg, a former mayor from Indiana, and former Texas congressman Beto O'Rourke - all endorsed the now Democratic frontrunner. Another former black candidate, ex-Massachusetts Governor Deval Patrick, has also backed Mr Biden, as did erstwhile rivals Mike Bloomberg, Tim Ryan and John Delaney. Despite Mr Booker's fulsome endorsement for Mr Biden, he has not always been so supportive. After a live TV debate in September, the New Jersey senator seemed to express doubts about the 77-year-old former vice-president's mental acuity.

"There were a lot of moments where a number of us on stage were looking at he each other, where [Biden] tends to go on sometimes" Booker said.

While opinion polls have raised questions about Mr Sanders' ability to connect with black voters, the Vermont senator picked up a coveted endorsement on Sunday from civil rights leader Jesse Jackson. Sanders has been endorsed by former rivals, Marianne Williamson and Bill de Blasio. The Democratic field once had more than two dozen candidates. Now effectively a two-man race, the eventual winner will be anointed at the party convention in July in Milwaukee, Wisconsin//BBCnews