Biden also was projected to win Vermont, and Trump won a caucus in Alaska.
The lingering question was whetherNikki Haleywould continue her bid for the Republican nomination as Trumps last remaining rival.
She was projected to win Vermont, denying Trump a sweep of all Super Tuesday contests.
(L-R) Donald Trump, Nikki Haley and Joe BidenGetty Images
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Otherwise, the former president scored lopsided margins of victory.
Lets keep an open mind, but the math doesnt lie.
Pundits began to focus on where Haleys voters would go to Trump or Biden if she drops out.
If we lose the election, were not gonna have a country left.
With Trump the likely GOP nominee, some coverage turned to Trumps choice of a running mate.
That said, pundits pointed to Haleys showing as still significant and a warning sign for Trump.
He added, This isnt just a nomination of a person.
Bidens wins were expected, but there was a surprise in the results of a caucus in American Samoa.
Jason Palmer, a long shot candidate, defeated Biden with 51 votes to the presidents 40.
Analysts also were watching the share of the uncommitted vote in Democratic contests.
In all, 16 states and one territory held contests on Super Tuesday.
That could come later this month.
Trump needs 1,215 delegates; Biden needs 1,968.
Major news networks featured countdown clocks to the first polls closing at 7 p.m. All three broadcast networks featured primetime specials devoted to the results.
Some of the more suspenseful races were down ballot.
They will advance to the November election.
Democratic assemblywoman Laura Friedman and Republican Alex Balekian were leading in the most recent results.
Baugh and Min were leading in the most recent results.
Los Angeles County District Attorney George Gascon faced a crowded field of challengers in his race for reelection.
Gascon has been the target of two recall efforts.
