According to The Wall Street Journal, State Senate President Steve Sweeney (D) will endorse Booker along with a "powerful contingent of South Jersey Democrats" on Wednesday.

The Newark Star-Ledger
is reporting Booker will also receive the endorsement of state Assembly Majority Leader Lou Greenwald (D).

“When I see the things that I have fought for in the state Legislature with the gun violence protection package, marriage equality and the issues around women’s health, I think Cory shares those commitments and visions,” Greenwald said of Booker on Tuesday.

On Thursday, he'll roll out the endorsements from Bergen and Passaic County Democratic Party leaders, the WSJ reported.

Booker's campaign did not confirm the endorsements, but Passaic County Democratic Party Chairman John Currie confirmed to The Hill that he'll be endorsing the mayor on behalf of the Passaic County Democrats.

Currie was recently elected as chairman of the New Jersey State Democratic Committee, and in that role, he said he will be staying neutral.

Bergen County Democratic Chairman Lou Stellato will make his endorsement after the party meets for its convention Wednesday night, and according to a source familiar with the proceedings, Booker is favored to take that endorsement by a wide margin.

The local names will join New Jersey Democratic powerbroker George Norcross and Maryland Gov. Martin O'Malley (D) in their support for the mayor, who has led by substantial double-digit margins in every poll of the Democratic primary field thus far.

He enters the race at a financial disadvantage to Rep. Frank Pallone (D), a strong fundraiser with deep ties to the New Jersey political establishment. Rep. Rush Holt (D) also has some of those local connections that Booker may lack.

But Booker maintains high name recognition due to his prominent national profile, after acting as a prolific surrogate for President Obama's reelection fight.

State Assembly Speaker Sheila Oliver (D) has also launched a bid, and all four will face off in the August primary.

Democrats are heavily favored to keep the seat vacated by deceased Sen. Frank Lautenberg (D).