Boston Mayor Michelle Wu is kicking off her campaign for re-election with a strong lead over her opponent Josh Kraft, according to an Emerson College poll released Thursday.

The endorsement is the first time in more than 30 years that the city's largest police union has supported a Boston mayor for reelection, the union said.

Michelle Wu holds a double-digit lead over philanthropist Josh Kraft in the race for Boston mayor, a new poll from Emerson College finds. The preliminary election to narrow the field down to two candidates is in September.

Boston Mayor Michelle Wu leads billionaire philanthropist Josh Kraft in the first poll of the city’s young mayoral campaign, but a decent share of voters remain up for grabs. Forty-three percent of respondents to the new Emerson College poll say they support the Democratic incumbent,

The survey offers the first early look at the matchup between the first-term progressive mayor and her most prominent challenger.

Boston’s largest police officers' union will endorse incumbent Mayor Michelle Wu for reelection on Thursday afternoon, its leadership said. The Boston Police Patrolmen’s Association said its members voted “overwhelmingly” to support Wu at the union’s most recent monthly meeting.