If each [chamber] is substantially framed upon the same plan, the advantages of the division are shadowy and imaginative.. . . In this view, the organization of the senate becomes of inestimable value. It represents the voice, not of a district, but of a state;...not of the interest of one state, but of all; not of the chosen pursuits of a predominant population in one state, but of all the pursuits in all of the states. . . .it is a most important and valuable part of the system, and the real balance-wheel, which adjusts, and regulates its movements. . . .