Seventeenth Amendment to the United States Constitution
The people of the United States are to elect two Senators from each state, for six years. Each Senator will have one vote in the Senate. There are 100 Senators and 100 votes. "The electors in each State shall have the qualifications requisite for electors of the most numerous branch of the State legislatures" means that anyone who can vote in a state election in their state, may also vote for a Senator. In the archaic language of the Constitution this was written in such a way to allow for states having different qualifications for persons eligible to vote for their Senator.