the vice president's only job, besides becoming president if the president dies, is to break a tie in a vote in the senate.
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The President of the Senate (Vice President of the United States) is given that authority in the US Constitution.
The Vice President of the US votes to break the tie. In Article 1 Section 3 of the Constitution it says that the Vice President becomes the President of the Senate, but has no vote, unless there it a tie.
John Adams holds the record for number of tie-breaking votes. He cast 29 votes while he was Vice President. Vice President John Calhoun is second with 28 tie-breaking votes.
Under the Senate's rules, a bill has to receive a majority (meaning more than half) of the votes to pass. Therefore, if there is a tie and there is no Vice President to break the tie, the bill fails because is has not received a majority. A previous answer asserted that the President Pro Tempore would break the tie--however, the President Pro Tem is a Senator and therefore would presumably have already voted.
to break a tie in the senate