She, too, will face tough questions about her continued presence in the race - particularly from Sanders supporters who think that she deprived their candidate of wins in closely contested states by siphoning off liberal voters. Biden has been allocated 16 of a possible 99 delegates.
Since his thumping victory in SC on Saturday, Biden has enjoyed one of the most impressive streaks by a modern presidential candidate. He's consolidated the center of his party after his sudden revival caused top rivals - former South Bend, Indiana, Mayor Pete Buttigieg and Minnesota Sen. Bernie Sanders won his home state of Vermont and Colorado, while Biden took Virginia, North Carolina, Alabama and Oklahoma.
Super Tuesday puts up for grabs over a third of the total delegates, including the 415 in California and 228 in Texas.
Former South Bend, Indiana mayor Pete Buttigieg won the most delegates in Iowa, but has now ended his campaign.
While votes are still being counted, Biden now stands as the frontrunner in the race for the Democratic nomination with 327 delegates. Bloomberg went from a nonexistent campaign to a staff of 2,400 people across 43 states in less than three months and said Wednesday that he received almost 2 million votes on Tuesday.
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The former vice president, who had been lagging in polls, won the SC primary on Saturday with half the vote and has garnered more than 100 endorsements from Democratic Party officials at every level. Final results from California could take a while to trickle in, so election night will not necessarily provide a complete picture.
Sen. Bernie Sanders seized perhaps the biggest victory of the night in California. The delegates are awarded based on the results of the primaries and caucuses.
The ultimate nominee must claim 1,991 delegates, which is a majority of the 3,979 pledged delegates available this primary season. However, Biden's big win in SC and the endorsements of two leading candidates could help him shore up the so-called moderate lane.
The former vice president will now carry a plurality of the state's 91 delegates while Warren will place third in her home state raising pressure on the MA progressive to drop out of the race. The numbers are expected to shift as new states report their numbers and as some candidates hover around the 15% vote threshold they must hit to earn delegates. "She didn't even come close to winning her home state of MA".