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Joe Biden has been projected to win the Massachusetts Democratic presidential primary.

The former vice president surprised some observers with his projected sweep of the New England state.

Meanwhile, Sen. Elizabeth Warren finished a disappointing third in her home state.

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With over three quarters of precincts reporting, Decision Desk HQ projects that former Vice President Joe Biden has won the Massachusetts Democratic presidential primary, edging out Sen. Bernie Sanders.

Home state Sen. Elizabeth Warren is having a disappointing night, coming in third.

Massachusetts primary results:

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—Joe Biden (Text Join to 30330) (@JoeBiden) March 4, 2020

Political commenters have expressed surprise over Biden's solid win in Massachusetts.

Meanwhile, Biden's victory over Warren on her home turf shows how her campaign is struggling in the wake of Sen. Amy Klobuchar and former South Bend Mayor Pete Buttigieg dropping out of the race and endorsing Biden. Insider's Walt Hickey noted that Klobuchar and Buttigieg built constituencies that could have been a good fit for Warren, and pushing them to Biden could be dire news for the Massachusetts senator.

Pre-primary:

What's at stake in the primary?

The state has been allocated 91 delegates who will go to Milwaukee in July to select the nominee, or 2.3% of the total number of delegates. 32 of those delegates will be allocated proportionally based on the state-wide vote, while the remaining 59 are won at the congressional district level.

As in all the Democratic primaries and caucuses this year, delegates at both the state and congressional district level are distributed in proportion to each candidate's vote share among those with at least 15% support in either the state or district.

The biggest prizes at the congressional district level are the state's 5th and 7th districts, which will allocate eight delegates each. The districts are both in the Boston area, as is the 8th congressional district, which has seven delegates.

Massachusetts is the home state of Sen. Elizabeth Warren, one of the remaining major candidates in the race. A win at home would bolster her flagging campaign, while losses here and in other Super Tuesday states could spell the end.

Who does the polling say is ahead?

According to RealClearPolitics' average of the latest polling data, Sen. Bernie Sanders held a narrow lead of 24.7% over Warren's 20.7% in pre-election polling. Former South Bend Mayor Pete Buttigieg, who dropped out of the race on Sunday, was in third place with 13.3%, followed by former New York City Mayor Mike Bloomberg at 11.7%, former Vice President Joe Biden at 10.7%. Sen. Amy Klobuchar, who dropped out of the race and endorsed Joe Biden, polled at 6.0%.

Based on those polling averages, all of the candidates aside from Sanders and Warren fell below the 15% threshold, which could put a serious limit on the number of delegates they could win in the state.

It's worth noting that most of the polling for Massachusetts, as well as the other Super Tuesday states, came before Biden's commanding win in South Carolina on Saturday and Buttigieg's departure from the race on Sunday.

According to FiveThirtyEight's election forecast, Sanders had a roughly 2 in 3 chance of winning the state, quite a bit higher than Warren's 3 in 10 chance.