The president of the senate only gets one vote and the president of the senate only votes if the other members of the senate end up in a tie.
when there's a tie. The vice president may only vote to break a tied senate vote.
Only in the case of a tie. There are 100 senators (two from each state). In the case of a tied vote, the vice president gets the deciding vote.
Ron dingles
Only when he has to break a tie.