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Under the Constitution, the Vice President serves as President of the Senate. He may vote in the Senate in the case of a tie, but is not required to. The President Pro Tempore (and others designated by him) usually perform these duties during the Vice President's frequent absences from the Senate.<ref>[http://www.senate.gov/reference/glossary_term/appropriation.htm president of the Senate] US Senate Reference</ref>

Under the Constitution, the Vice President serves as President of the Senate. He may vote in the Senate in the case of a tie, but is not required to. The President Pro Tempore (and others designated by him) usually perform these duties during the Vice President's frequent absences from the Senate.<ref>[https://www.senate.gov/reference/glossary_term/appropriation.htm president of the Senate] US Senate Reference</ref>

In practice, the number of times vice presidents have exercised this right of vote has varied greatly. [[John Adams]] holds the record at 29 votes, followed closely by John C. Calhoun with 28.<ref>[http://www.corzine.senate.gov/artandhistory/history/common/briefing/Vice_President.htm Vice President of the United States (President of the Senate)]</ref>

In practice, the number of times vice presidents have exercised this right of vote has varied greatly. [[John Adams]] holds the record at 29 votes, followed closely by John C. Calhoun with 28.<ref>[http://www.corzine.senate.gov/artandhistory/history/common/briefing/Vice_President.htm Vice President of the United States (President of the Senate)]</ref>