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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] 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>[http://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.  

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>

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