Joe Biden 2020: Former vice-president enters US election race in 'battle for soul of this nation'
Former vice president Joe Biden has officially joined the Democratic presidential contest to replace Donald Trump in 2020.
The 76-year-old lifelong politician becomes an instant front-runner alongside Bernie Sanders, who is leading many polls.
The announcement, made in a video posted on Twitter, marks the unofficial end of the chaotic early phase of the 2020 presidential season.
At least 20 Democrats have put their names in the hat for the chance to take on the incumbent Republican president next year, while several lesser-known candidates may still join the race.
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