Embattled Brooklyn Assemblywoman Mathylde Frontus has pulled ahead of her Republican rival — an apparent supporter of the QAnon conspiracy theory — after mail-in votes were counted in her district, according to sources.

The first-term Dem had trailed GOP challenger Mark Szuszkiewicz by 2,822 votes in the machine count on election night — 17,852 to 15,030 — in the typically blue 46th Assembly District, which takes in the southern Brooklyn neighborhoods of Sea Gate and Coney Island and parts of Brighton Beach, Gravesend and Bay Ridge.

But there were at least 3,919 absentee ballots to be counted. The lion’s share — 2,581 were cast by Democrats, along with 829 deemed “blank” or having no party affiliation, and just 408 from Republicans.

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