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Black voters propel Biden to big wins in Virginia, NC, Alabama

Former Vice President Joe BidenJoe BidenLawsuit alleges 200K Georgia voters were wrongly purged from registration list GOP lawmaker blasts incoming freshman over allegations of presidential voter fraud Haaland has competition to be first Native American to lead Interior  MORE is off to a strong Super Tuesday start after he was declared the winner of the Virginia, North Carolina and Alabama primaries by networks immediately as polls closed in both states.

Exit polls suggested Biden was bolstered by heavy support from African American voters, a development that had previously boosted him in South Carolina and portends well for his chances in other Southern states holding primaries Tuesday.

Polls had shown a tight race between Biden and Sen. Bernie SandersBernie SandersFormer Sanders press secretary: 'Principal concern' of Biden appointments should be policy DeVos knocks free college push as 'socialist takeover of higher education' The Hill's 12:30 Report — Presented by Capital One — Giuliani denies discussing preemptive pardon with Trump MORE (I-Vt.) in Virginia and North Carolina as recently as last week.

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But Biden’s big victory in South Carolina gave him a burst of momentum that could help blunt the advantage Sanders likely will have when polls close in California later tonight.

Biden was boosted by a string of endorsements from high-profile Virginians, including Sen. Tim KaineTimothy (Tim) Michael KaineCongress set for chaotic year-end sprint Democrats face increasing pressure to back smaller COVID-19 stimulus Rick Scott tests positive for coronavirus MORE (D), former Gov. Terry McAuliffe (D), and Democratic Reps. Bobby ScottRobert (Bobby) Cortez ScottDeLauro wins Steering Committee vote for Appropriations chair National reading, math tests postponed to 2022 amid coronavirus surge Trump officials approve Georgia plan to remove healthcare.gov as enrollment option MORE, Jennifer WextonJennifer Lynn WextonVirginia voter registration website back up after outage on last day to register House advances bill aimed at imports tied to Uighur forced labor This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE and Don Beyer. 

And he’s benefiting from strong support among African Americans, taking more than 70 percent support among black voters in Alabama. Alabama is more than 40 percent black and has the largest population of black voters out of all the Super Tuesday states.

Exit polls in Virginia showed Biden taking about 66 percent support among black voters there as well.

The Democratic electorates in Virginia and North Carolina, as well as states across the Deep South, are more than a quarter black, according to exit polls.

In 2016, Sanders failed to win any state that had a black population of more than 21 percent, and that dynamic appears to be hampering him on Super Tuesday.

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Sanders, however, has strong support from Latinos, who helped him to a big victory in the Nevada caucuses. That could come into play later tonight in California and Texas, the two largest delegate hauls of the primary season.

Biden’s victories in Virginia and North Carolina are also harmful to former New York City Mayor Michael BloombergMichael BloombergBiden's great challenge: Build an economy for long-term prosperity and security The secret weapon in Biden's fight against climate change Sanders celebrates Biden-Harris victory: 'Thank God democracy won out' MORE, who launched his campaign after becoming worried that Biden looked like a weak front-runner.

Bloomberg invested and campaigned heavily in Virginia, visiting it more than any other Super Tuesday state. He spent more than $12 million in North Carolina.

Now Biden stands to win at least a plurality of North Carolina’s 110 delegates and Virginia’s 99. 

Sanders, meanwhile, easily won the primary in his home state of Vermont, where 16 delegates were up for grabs.

Polls are still open in California, where 415 delegates are at stake, and Texas, which accounts for 228 delegates. 

Sanders will be looking to run up the score in California, the largest delegate prize on the map.

All told, about 1,300 delegates will be awarded Tuesday, accounting for about one-third of all pledged delegates up for grabs. 

A candidate must win 1,991 delegates to clinch the Democratic presidential nomination.

Updated at 8:07 p.m.