Metro

Republican and Democrat win state senate contests, and Democrat wins House race

Republican Patrick O’Connor defeated Democrat Joan Meschino in a special state Senate election Tuesday night, while Democrats Joseph A. Boncore and Daniel Cahill claimed victories in separate unopposed state legislative races.

O’Connor, the Weymouth Town Council president, received 9,059 votes and Meschino, a former Hull selectwoman, received 8,092 votes, to win the seat representing the Plymouth and Norfolk senate district, according to unofficial returns.

He will replace Republican Robert Hedlund, who resigned after being elected mayor of Weymouth last year. The district includes Weymouth, Hull, Cohasset, Duxbury, Hingham, Marshfield and Scituate.

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In a separate election Tuesday, Boncore, an attorney, won an unopposed race for the First Suffolk and Middlesex District, a seat formerly held by Democrat Anthony Petruccelli, who left the senate to join a lobbying firm.

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Cahill, the Lynn city council president, won the state representative seat for the 10th Essex district, also without a Republican opponent. He will replace Robert Fennell, a Democrat who left to become the deputy director of the Lynn Water & Sewer Commission.

O’Connor worked as Hedlund’s aide before being elected to the town council.

“I’m really focused on making sure we’re able to provide this district with the representation it deserves,” O’Connor said in a brief phone interview Tuesday night. “We’ve been without a state senator for a while now, and I’m looking forward to getting up there.”

Governor Charlie Baker said in a statement released by the state Republican party that O’Connor’s victory affirms that voters wanted an “efficient and accountable state government.”

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“I’m looking forward to working with Patrick to advance our shared agenda of lower taxes, expanded educational opportunity, and safe, thriving communities across the South Shore and Massachusetts,” Baker said.

Olivia Arnold can be reached at olivia.arnold@globe.com. Follow her on Twitter @olivia_arnold12.