Cory Booker: Joe Biden endorsed by another ex-rival

Democratic presidential hopeful Joe Biden has picked up another prize endorsement from a former rival, Cory Booker.

The New Jersey senator tweeted: "The answer to hatred & division is to reignite our spirit of common purpose."

He added that Mr Biden "won't only win - he'll show there's more that unites us than divides us".

Mr Biden and Bernie Sanders are vying to be the Democratic nominee who will face Donald Trump in November.

Kamala Harris, who was the only black woman in the Democratic field before she ended her...