IV. The number of senators, and the duration of their appointment, come next to be considered. In order to form an accurate judgment on both of these points, it will be proper to inquire into the purposes which are to be answered by a senate; and in order to ascertain these, it will be necessary to review the inconveniences which a republic must suffer from the want of such an institution.
First. It is a misfortune incident to republican government, though in a less degree than to other governments, that those who administer it may forget their obligations to their constituents, and prove unfaithful to their important trust. In this point of view, a senate, as a second branch of the legislative assembly, distinct from, and dividing the power with, a first, must be in all cases a salutary check on the government. It doubles the security to the people, by requiring the concurrence of two distinct bodies in schemes of usurpation or perfidy, where the ambition or corruption of one would otherwise be sufficient. This is a precaution founded on such clear principles, and now so well understood in the United States, that