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California Atty. Gen. Kamala Harris will announce Tuesday that she is running for the U.S. Senate seat being vacated by Barbara Boxer, according to a Harris advisor.

California Attorney General Kamala Harris speaks onstage at the 2014 Variety Power of Women presented by Lifetime at Beverly Wilshire Four Seasons on Oct. 10, 2014, in Los Angeles. (Credit: Jason Merritt/Getty Images for Variety)
California Attorney General Kamala Harris speaks onstage at the 2014 Variety Power of Women presented by Lifetime at Beverly Wilshire Four Seasons on Oct. 10, 2014, in Los Angeles. (Credit: Jason Merritt/Getty Images for Variety)

“She’s not testing the waters. She’s charting the course. She’s in with both feet,” said the source who requested anonymity while discussing Harris’ plans.

The move comes as Lt. Gov. Gavin Newsom announced Monday that he would not run for the seat, averting an ugly battle between two Democrats who share many of the same supporters, have national profiles, are both from the Bay Area and are popular with the liberal wing of the party.

Harris, 50, who is in her second term as attorney general, previously served as the district attorney of San Francisco. She is the first candidate to officially declare. Boxer announced last week that she would not seek reelection in 2016, setting off a scramble among Democrats who have not seen an open U.S. Senate seat since 1992.

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