Michelle Wu called on her top challenger Josh Kraft to release his tax returns to reveal any financial interests or business “entanglements” he may have with the city that could impede his ability

With weeks to go before the Sept. 9 preliminary election, the math remains daunting for Boston mayoral hopeful Josh Kraft.

Boston Mayor Michelle Wu is leading Josh Kraft by 30 points with about a month to go before the first ballots are cast in the city's preliminary election.