New York’s Democratic Civil War has opened up a new battlefront on Staten Island, The Post has learned.

The most recent casualty is the head of the borough’s Democratic Party, who is stepping down over backlash she faced for unilaterally backing socialist Zohran Mamdani for NYC mayor, sources told The Post.

“Staten Island is not Mamdani Country” and party chairwoman Laura LoBianco Sword “went out of her way to endorse him without the executive committee’s support, and people are in an uproar,” said a top borough Democratic operative.

“It wasn’t like the world was crying out for Staten Island’s endorsement. She went out of her way to do it.” 4

The conflict in the so-called “Forgotten Borough” erupted at the same time longtime state Democratic Party leader Jay Jacobs is being press

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