Democrats have nominated political newcomer Emily Bjornberg of Lyme to challenge one-term incumbent Republican State Senator Art Linares of Westbrook in the 12-town 33rd Senate district.

Bjornberg, 33, was the unanimous choice of the 45 delegates gathered for the Democratic convention at the Old Town Hall in Haddam. Linares, 25, was nominated by delegates at the May 12 Republican convention at the Riverhouse in Haddam.

Linares, cofounder of a Middletown-based solar energy company, was elected in a three-way contest in 2012, succeeding a 20-year Democratic incumbent, former Sen. Eileen Daily of Westbrook. Ljnares defeated Jim Crawford of Westbrook, who was then serving as a state representative, on a 23,915-21,251 vote in a race where an active Green Party candidate, Melissa Schlag of Haddam, garnered 4,317 votes. Schlag later rejoined the Democratic Party was elected last year as first selectwoman of Haddam, She was present at the convention Monday to support Bjornberg.

Also offering support at the convention was Lt. Governor Nancy Wyman, telling delegates “we’re finally going to get someone who will replace Eileen Daily.” Bjornberg was nominated by Crawford, with seconding remarks from Mary Ellen Klinck of East Haddam, who competed with Crawford for the party nomination at an August 2012 Democratic primary, and Daily.

Bjornberg, the married mother of two grown children, contended Linares’s views and votes over the part 18 months are “clearly out of step with the majority of his constituents.” She cited Linares vote against raising the minimum wage, and opposition to bills that included grant funding for local projects in the district.

Bjornberg said Linares would often vote against total funding bills, and then claim credit for grants that are awarded for projects in district towns. “I will be a strong voice for our district inside the majority caucus,” she said.

Linares was nominated last week by former state representative and environmental protection commissioner Sidney Holbrook of Westbrook, with seconding remarks by Carl Chuznik of Portland. Linares told the delegates he would continue efforts to improve the business climate in Connecticut and support policies that provide more flexibility and local control in education.

The 33rd Senate District includes the towns of Chester, Clinton, Colchester, Deep River, East Haddam, East Hampton, Essex,, Lyme, Portland, Westbrook, and sections of Old Saybrook.