Joe Biden has won half of the 14 states that voted to pick a Democratic White House candidate on Super Tuesday, in a remarkable rebound for his campaign.
The former US vice-president has swept Minnesota, Oklahoma, Arkansas, Alabama, Tennessee, North Carolina and Virginia.
Left-wing Senator Bernie Sanders is projected to win Colorado, Utah and his home state of Vermont.
They lead the race to anoint a Democrat who will face President Donald Trump, a Republican, in November's election.
Mr Biden, a moderate who served under President Barack Obama, and Mr Sanders, a left-winger, offer starkly different visions for America's future.
CBS News, the BBC's US partner, projects Massachusetts is also leaning Mr Biden's way, a heavy blow to his rival and the liberal state's own Senator, Elizabeth Warren.
Buoyed by last-minute endorsements from former rivals who dropped out of the race, Mr Biden is hoping to blunt the momentum of Mr Sanders, who was the frontrunner nationally on the eve of the vote.
Mr Biden's under-staffed and under-funded campaign has been resurgent since his commanding win in South Carolina's primary at the weekend. It was the first time the 77-year-old had won any contest in three White House runs.
Exit poll data suggests Mr Biden has won large majorities of African-American voters, a crucial bloc for the Democratic party.
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