The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Stated as firm, per the City of Boston[2][4] Election Department tally: "PRELIMINARY MUNICIPAL ELECTION - SEPTEMBER 9, 2025 - MAYOR".
The Election Department's official ballots-cast and turnout breakdown for the same election (93,861 ballots, 21.96%).[1]
WBUR's election-night report: 72% to 23%, the AP call 18 minutes after polls closed, campaign spending and issues.
The Election Department's 2025 calendar: 'September 9, 2025 PRELIMINARY MUNICIPAL ELECTION (7AM- 8PM)' and how the preliminary narrows the mayoral field to the top two.[1]
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