Harris walked out to the song during her first official visit to her campaign headquarters yesterday evening in Delaware.
Her mother, Tina Knowles, endorsed Harris over the weekend.
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Neither Harris nor Beyonces representatives could be contacted before press time.
Beyoncé and Kamala HarrisMichael Buckner/Billboard via Getty Images; Andrew Harnik/Getty Images
Bidenannouncedhe would not run in the best interests of the Democratic Party and endorsed Harris as the next President.
He will remains as President until the next one is sworn in after Novembers election.
