NEW YORK — Christine C. Quinn, the New York City Council speaker, declared her candidacy for mayor on Sunday with a glossy biographical video and a walking tour of the city, a signal that her campaign hopes to attract voters with her outsize, off-the-cuff personality — or at least a carefully curated version of it.
Skipping a speech in favor of a day of campaigning, Quinn, a Democrat, opted for an intimate approach to a high-profile moment of her mayoral bid, a contrast to the businesslike style of Mayor Michael R. Bloomberg, her political ally and the man she hopes to replace in City Hall.
Yet the Christine Quinn who appears in the highly polished video is a far cry from the head-clunking, hard-nosed deal maker who maintains an iron rule over the City Council.
Here, she is seen in a warm, welcoming pose, clad in a fuzzy fuchsia blazer and floral necklace, chatting amiably at the counter of a 1950s-style diner complete with a covered glass cake stand.
Accompanied by piano music, Quinn, 46, reminisces about her father’s union activism and middle-class upbringing on Long Island.
She names legislation she shepherded through the council, highlighted by on-screen graphics like ‘‘good public schools’’ and ‘‘affordable child care.’’ She becomes misty-eyed as she describes her mother’s death from breast cancer when Quinn was a teenager.
Quinn, who married her longtime partner, Kim Catullo, last year, has attracted national attention for the historic nature of her bid to become New York City’s first openly gay mayor.
The announcement on Sunday was essentially a formality for Quinn, who has spent years preparing a bid for mayor.