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For weeks, she’s been on a national tour promoting her memoir. This month, Politico reported that she shut down her state campaign committee and donated the rest of the money she raised for a California race, about $1 million, to causes including the Coalition for Humane Immigrant Rights and a foundation that helps firefighters.

But only as of yesterday — not coincidentally, Martin Luther King’s Birthday — was it official: Senator Kamala Harris is running for president in 2020.

She announced her run on “Good Morning America,” not in her hometown, Oakland, as a local radio station’s sources had predicted earlier. She will, however, hold a rally there on Sunday.

“The core of my campaign is the people,” Ms. Harris said later in the day at Howard University, the historically black college she attended in the 1980s. “Nobody is living their life through the lens of one issue. And I think what people want is leadership that sees them through the complexity of their lives and pays equal attention to their needs. Let’s not put people in a box.”