Former NAACP chief Ben Jealous has defeated Prince George's County Executive Rushern Baker in the Democratic primary contest for governor.

WASHINGTON — Former head of the NAACP Ben Jealous won a decisive victory Tuesday night in the Democratic primary contest for Maryland governor, besting Prince George’s County Executive Rushern Baker in a race that pitted an insurgent candidate from the party’s progressive wing against a tried-and-true member of the state’s Democratic establishment.

The Associated Press called the race for Jealous shortly after 10:30 p.m.

Speaking to supporters at the Reginald F. Lewis Museum of Maryland African-American History and Culture on Tuesday night, Jealous said Baker had called to concede the race.

Screams of joy here - as news comes that Rushern Baker has conceded to @BenJealous @WTOP @LewisMuseum pic.twitter.com/mOSbfKyeHD — Michelle Basch (@mbaschWTOP) June 27, 2018 Maryland Democratic gubernatorial candidate Ben Jealous, right, addresses supporters as his son Jack, left, looks at his reflection in a teleprompter screen at an election night party, Tuesday, June 26, 2018, in Baltimore. Also pictured is Jealous’ daughter, Morgan, second from left. Jealous won the Democratic nomination for governor in Maryland, setting up a battle against popular incumbent Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky Maryland Democratic gubernatorial candidate Ben Jealous addresses supporters at an election night party, Tuesday, June 26, 2018, in Baltimore. Jealous won the Democratic nomination for governor in Maryland, setting up a battle against popular incumbent Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky Prince George’s County Executive Rushern Baker speaks with reporters after his loss to former NACCP head Ben Jealous in the Democratic primary for Maryland governor. (WTOP/Kate Ryan) WTOP/Kate Ryan Maryland Democratic gubernatorial candidate Ben Jealous addresses supporters at an election night party, Tuesday, June 26, 2018, in Baltimore. Jealous won the Democratic nomination for governor in Maryland, setting up a battle against popular incumbent Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky .@BenJealous says he’s not running to the left or right, he’s “running to the people of our state” More in video @WTOP pic.twitter.com/n9Z2SArEV5 — Michelle Basch (@mbaschWTOP) June 27, 2018 (AP/Patrick Semansky) Maryland Democratic gubernatorial candidate Ben Jealous, center, walks onstage with his son Jack, left, and daughter Morgan before addressing supporters at an election night party, Tuesday, June 26, 2018, in Baltimore. Jealous won the Democratic nomination for governor in Maryland, setting up a battle against popular incumbent Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky Maryland Democratic gubernatorial candidate Ben Jealous addresses supporters at an election night party, Tuesday, June 26, 2018, in Baltimore. Jealous won the Democratic nomination for governor in Maryland, setting up a battle against popular incumbent Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky Maryland Democratic gubernatorial candidate Ben Jealous addresses supporters at an election night party, Tuesday, June 26, 2018, in Baltimore. Jealous won the Democratic nomination for governor in Maryland, setting up a battle against popular incumbent Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky Maryland Democratic gubernatorial candidate Ben Jealous addresses supporters at an election night party, Tuesday, June 26, 2018, in Baltimore. Jealous won the Democratic nomination for governor in Maryland, setting up a battle against popular incumbent Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky Dallas Matthews, left, and Tabitha Jackson, supporters of Maryland Democratic gubernatorial candidate Ben Jealous, watch voting results during an election night party, Tuesday, June 26, 2018, in Baltimore. Jealous and Prince George’s County Executive Rushern Baker lead a crowded Democratic primary field to win a nomination to face popular Republican Gov. Larry Hogan in the fall. (AP Photo/Patrick Semansky) AP/Patrick Semansky ( 1 /11) Share This Gallery: Share on Facebook. Share on Twitter. Share via email. Print.

Jealous opened an early and, ultimately overwhelming, lead over Baker during Tuesday’s vote-counting. As of 12 a.m. Wednesday, with 99 percent of precincts statewide reporting results, Baker trailed Jealous by more than 10 percentage points.

Polling in the final weeks indicated the race had mostly tightened to a two-person race between Baker, who had racked up an endorsement from The Washington Post, and many of the state’s most prominent party leaders, and Jealous, who snagged endorsements from Sens. Bernie Sanders, Cory Booker and Kamala Harris.

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Jealous, who was endorsed by the Maryland State Education Association, has also promised to boost teacher salaries by 29 percent.

Jealous will challenge Republican popular Republican Gov. Larry Hogan in the general election.

Democrats outnumber Republicans in Maryland by a margin of 2 to 1 and President Donald Trump is deeply unpopular in the state. Still, most political analysts say it’s uncertain whether a predicted “blue wave” in November will be strong enough to wash the popular Hogan out of the governor’s mansion in the general election.

In a June 2018 Washington Post-University of Maryland poll, 71 percent of Marylanders said they approved of the way Hogan is handling his job as governor.

In the same poll, more than half of respondents — 51 percent — said they would vote for Hogan over Jealous.

Still, analysts predict the race to tighten once a Democratic nominee is selected.

In a tweet, Hogan congratulated Jealous on his primary victory and said he looked forward “to a vigorous debate on the direction of our state and the issues that matter most to Marylanders.”

“We are ready to pull our party together and go out there and beat Larry Hogan,” Jealous said during a lengthy address to supporters Tuesday night.

In his speech, Jealous told the crowd of cheering supporters: “I’m not running to the left; I’m not running to the right; I’m running towards the people of our state. Health care, education, mass incarceration, ending the student debt crisis and protecting the environment are people issues.”

Jealous would be the first African-American governor of Maryland if he’s elected in November. Jealous’ running mate is Susie Turnbull.

WTOP’s Michelle Basch contributed to this report.