Biden's biting attacks on Buttigieg's relatively thin resume mark a new, more aggressive attempt to slow the momentum of the youngest candidate in the Democratic field.

Three days before the critical New Hampshire Primary, seven Democratic presidential candidates debated, with many of them fighting to survive in the race to challenge U.S. President Donald Trump. Here are some key takeaways.

Friday’s debate in New Hampshire — coming four days before the state’s primary — offers new opportunity and risk for the shrinking pool of White House hopefuls.