After debate, Democrats will try to gain traction

Democratic presidential front-runner Joe Biden survived another debate night of sustained criticism, while many of his rivals for the Democratic Party’s 2020 presidential nomination leave Detroit hoping they did enough to keep their bids alive.

This week’s back-to-back debates gave 20 contenders in the field vying for the party’s nomination to challenge Republican President Donald Trump next year a chance to make their cases to a national audience and assert distinctions on policy and style.

U.S. Senators Elizabeth Warren and Bernie Sanders teamed up on Tuesday night to defend their...