March 10 primaries live updates: Biden bests Sanders in 4 states

Biden won in delegate-rich Michigan, along with Missouri and Mississippi, according to NBC News projections. Washington was too close to call.
Chelsea Stahl / NBC News

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Joe Biden won the Democratic primary in Michigan Tuesday, NBC News projected, and further extended his delegate lead over Bernie Sanders with additional wins in Mississippi and Missouri and Idaho.

Get the latest race results and delegate totals

Sanders won North Dakota, NBC News projected Wednesday morning, but Washington's primary election remains too close to call. More than 350 delegates will ultimately be allocated from the six states that voted Tuesday — the fourth-largest day on the primary calendar for the Democratic candidates.

Highlights from Tuesday's election:

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How Bernie Sanders can stay competitive with wins in Michigan, Washington

5 things to watch on Super Tuesday II: Sanders' revolution faces a reckoning

Super Tuesday resurrected Joe Biden’s campaign and powered him into a delegate lead. Super Tuesday II must revive Bernie Sanders or the nomination could slip away from him again.

A new CNN poll shows Biden leading Sanders by a margin of 52 percent to 36 percent in a two-person race. The biggest dividing line is age — voters under 45 said they prefer Sanders by nearly 2-to-1, while voters 45 or older picked Biden by more than 4-to-1.

That generational gap looms over another big day of voting Tuesday, with Democratic voters in Michigan, Idaho, Mississippi, Missouri, North Dakota and Washington set to deliver their verdict on who the party’s nominee to take on President Donald Trump should be. It’s also the last day for Democrats living abroad to participate in the primary.

Here are five things to watch on Super Tuesday II.

Tuesday's primary states brace for strong turnout, hope to avoid long lines

The six states voting in the primaries and caucuses Tuesday are bracing for a strong turnout after some voters in California and Texas waited hours in long lines to cast their ballots.

Election officials and experts are hoping that with less new technology, more paper-based methods and early and absentee voting options, the states — Idaho, Michigan, Mississippi, Missouri, Washington, and North Dakota — have fewer bottlenecks. But other changes may delay reporting of the results.

“We do not anticipate unusually long lines in the March 10 states, primarily due to variables such as voting methods, state sizes and the absence of major process changes such as the introduction of Vote Centers,” Eddie Perez, an election administration analyst with the technology group OSET Institute, said in an email.

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Sanders and Biden scrap on the airwaves in Tuesday's states

WASHINGTON — It may not be super, but as the Democratic race hits the latest round of contests today, Joe Biden is looking to replicate his strong showing on last week's Super Tuesday and widen his delegate lead over Bernie Sanders. 

The Sanders campaign is outspending Biden on the TV and radio airwaves across the six states that hold their nominating contests today — $2.9 million to Biden's almost $2.2 million, according to Advertising Analytics. But Biden's effort has been boosted by spending from his allied super PAC, Unite the Country. 

Both campaigns are spending the most in Michigan — Sanders and Biden have spent about $1.2 million each, with Unite the Country spending another almost $400,000.  

The Biden campaign and his super PAC have also run ads in Missouri and Mississippi, but neither have spent a cent on TV or radio ads in Washington, Idaho and North Dakota.

The Sanders campaign, by comparison, has gone up on the airwaves in all six states voting Tuesday. 

Sanders' top ad across these states, according to Advertising Analytics data, is one that attacks Biden on social security by using audio from a speech in 1995 where he called for a spending freeze across the government. His campaign has spent more than $644,000 to air the ad in states holding votes on Tuesday. 

The Biden campaign has bristled at those attacks, and has spent almost $200,000 in those states on ads that criticize Sanders for going negative and argue Biden has said he'd expand Medicare and Social Security. 

Biden's top ads in the states voting Tuesday are different versions of the same spot, which feature former President Obama's praise of Biden as "an extraordinary man with an extraordinary career in public service." 

And Unite Our Country has spent $376,000 in these states on a spot that quotes Biden talking about his campaign, and includes some brief swipes at Sanders (Biden is quoted int he ad saying he wants to "build on ObamaCare" instead of scrapping it, and "Democrats want a nominee who is a Democrat"). 

FIRST READ: Sanders defied the odds in Michigan once before. A replay might be much harder.

Four years ago, Bernie Sanders shocked the political world and defied the public polling by winning the Michigan primary — even though he was unable to change the overall delegate math.

But here are three reasons why Sanders winning Michigan tonight on this Above-Average Tuesday would be an even bigger surprise than it was in 2016.

Bill de Blasio wants Warren to endorse Sanders


Kansas City's mayor says he got turned away from his polling place

Missouri has experienced minor technical issues as its primary election is underway.

Kansas City Mayor Quinton Lucas tweeted a video that he had been turned away at the polls this morning. "I wasn’t in the system even though I’ve voted there for 11 years, including for myself four times!" he wrote.

But that was the result of a simple user error, Missouri Secretary of State Jay Ashcroft told NBC News.

"He's in the system. He's registered. He has been registered. The poll worker misspelled his name," Ashcroft said.

Missouri does not require voters to present identification when voting, but Ashcroft said he recommended voters present them to avoid misspellings.

Other voters reported glitches that prevented them from voting normally.

Adam Rygiol, 34, said that even though registration tablets at his polling location in Jackson County, MO, recognized he was eligible to vote, he and another man couldn't complete their ballot normally, and had to sign provisional ballots.

"My understanding is that some of those tablets were not communicating with each other between 6:00 and 6:30" in Jackson and St. Louis Counties, Ashcroft said, but that affected voters could vote provisionally, and that the problem had since been resolved.

What the polls show for Biden and Sanders in Michigan and elsewhere

Democratic voters in six states will make their choices for president known Tuesday, when more than 350 delegates are at stake.

Joe Biden has been rising in the polls since his Super Tuesday surge — when he won 10 states, building on a decisive victory in South Carolina — but Bernie Sanders will compete in several states that handed him victories in 2016.

Here's what the latest polls show could happen.

Everything you need to know about Tuesday's primaries

There are primaries in Idaho, Michigan, Mississippi, Missouri and Washington and caucuses in North Dakota on Tuesday, and the results in most of the states should be known within hours of the polls closing — 8 p.m. ET for the earliest states and 11 p.m. ET for the latest. 

Here's everything else you need to know.