SAN FRANCISCO (KPIX) – From the very beginning of her chat with San Francisco Mayor London Breed, there were thinly veiled jokes dancing around the subject of a presidential run by Democratic Senator Kamala Harris.

“We are dying to know. We are all dying to know…this important question that everybody is always asking you everywhere – do you really walk around in those stilettos all day?,” asked Breed, drawing laughter from the audience.

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Senator Harris was back from Capitol Hill to promote her new book, “The Truths We Hold.” It is the kind of book that is often a precursor to a campaign kickoff.

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She is expected to announce her bid for the 2020 presidential election soon.

Fellow democrats Elizabeth Warren, Julian Castro, and Tulsi Gabbard have already announced their candidacy.

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A picture book for children will accompany “These Truths We Hold.”