Actually, there are a limited amount of people in the Senate. Anyway, the bill is passed when there are more votes to pass the bill EX: 60 wants bill, 25 doesn't
The Senate can defeat a bill with 51 votes.
3/4 votes from the state legislature, house of representatives and senate
When the Senate's Republican caucus wants party members to vote for a bill, the person who determines how many votes can be counted on is the whip.
A simple majority ( 51 votes if all vote) will pass any bill in the Senate. (Please note that all tax bills must originate in the House.)
A two-thirds majority vote in both the House of Representatives and in the Senate is required to override a presidential veto.
Whip.
Whip
If all members vote, 51 votes are needed to pass a bill. Otherwise it passes if more than half of the votes are "Ayes".
The senate president,as many as votes get to the whole courtroom.
The whips
52
House and Senate BOTH must have a 2/3 majority based on how many vote in each chamber. Not all House or Senate members vote on every issue. So the number of votes needed depends on how many actually vote.