With the preliminary election about a month away, Boston Mayor Michelle Wu is breaking out the big guns.

Former Boston Red Sox great David Ortiz, who endorsed Wu back in May, appears -- or at least his voice and his likeness does -- in a new campaign ad for the mayor, who is set to face off against Josh Kraft, Domingos DaRosa and Robert Cappucci in the Sept. 9 preliminary.

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The "Bold Boston" super PAC released a new video Thursday featuring a cartoon version of Ortiz urging voters to cast their ballots for Wu.

“Everybody knows Big Papi loves Boston… and that’s why he’s going to bat for Mayor Michelle Wu,” the narrator says in the 30 second video, which also references Ortiz's famous post Boston Marathon bombing quo

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