How, if at all, has equal representation in the senate affected the principle of majority rule?

I think the Senate are represent the wise people in the states, having equal representation in the Senate makes the law harder to pass, because it require both house to agree on this issue, and it deduced the principle of majority rule. 

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.