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The former vice president has effectively been his party’s leader since his last challenger in the Democratic primary, Bernie Sanders, ended his campaign in April. But Biden pulled together the 1,991 delegates needed to become the nominee after seven states and the District of Columbia held presidential primaries Tuesday.
Biden reached the threshold three days after the primaries because several states, overwhelmed by huge increases in mail ballots, took days to tabulate results. Teams of analysts at The Associated Press then parsed the votes into individual congressional districts.
Democrats award most delegates to the party’s national convention based on results in individual congressional districts.
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Biden spent 36 years in the Senate before becoming Barack Obama’s vice president. This is 77-year-old Biden’s third bid for the presidency.