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Biden, Warren, Sanders, Harris - for the first time all the front-runners will share the spotlight.
Former US Vice-President Joe Biden has come under attack from other Democratic 2020 candidates in a second round of televised debates. Mr Biden - the frontrunner in the polls - had several sharp exchanges with the nine other presidential hopefuls sharing the stage in Detroit. Senator Kamala Harris again launched an assault on Mr Biden's record on race but had to defend her stance towards drug offenders when she was a prosecutor in California. The winner of the Democratic presidential nomination will be announced next July and they will face President Donald Trump in the election in November 2020. Jacqueline Thompson from the political news site The Hill explains how the debate unfolded. (Photo: Vice-president Joe Biden and Senator Kamala Harris. Credit: Reuters)
From well-rehearsed zingers to off-the-cuff comebacks, the debate answers that provoked a reaction.
The former vice-president came under attack for his record on immigration when in the White House.
Challenged by more moderate contenders, Senator Elizabeth Warren questioned what motivates their bids.