evidence: Tie-breaking votes cast by Kamala Harris in the U.S. Senate Vice President Kamala Harris (D) has cast 33 tie-breaking votes in the U.S. Senate. The majority of Harris' tie-breaking votes, 26, were cast during the 117th Congress, when the U.S. Senate had a 50-50 partisan makeup. The rest of her votes were cast during the 118th Congress, when the U.S. Senate had a 51-49 Democratic majority. [...] John Adams cast the first tie-breaking vote on July 18, 1789. As of December 5, 2023, there were 301 tie-breaking votes from 37 vice presidents. Kamala Harris (D) (2021-present) has cast the most tie-breaking votes (33) during her tenure as vice president, John C. Calhoun (1825 - 1832) cast the second most (31), and Adams (1789 - 1797) cast the third most (29).