To Avoid Debacles Like Roy Moore, Repeal The 17th Amendment The Federalist, Nov 16, 2017, Daniel Davidson
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The idea that state legislatures would elect senators might seem odd nowadays, but creating some distance between the popular vote and the election of senators was crucial to the Founders’ grand design for the republic. The original idea, spelled out in The Federalist Papers, was that the people would be represented in the House of Representatives and the states would be represented in the Senate. Seats in the House were therefore apportioned according to population while every state, no matter how large its populace, got two seats in the Senate.
The larger concept behind this difference was that Congress needed to be both national and federal in order to reflect not just the sovereignty of the people but also the sovereignty of the states against the federal government. In Federalist No. 62, James Madison explained that Congress shouldn’t pass laws “without the concurrence, first, of a majority of the people, and then of a majority of the states.”
Besides tempering the passions of the electorate, empowering state legislatures to elect senators was meant to protect the states from the encroachments of the federal government. The tension was (and still is) between the dual sovereignty of the national government and the states. Writing in Federalist No. 39, Madison explains that while the House of Representatives is national because it “will derive its powers from the people of America,” the Senate “will derive its powers from the States, as political and coequal societies.” We’ve lost much of this today, but the jurisdiction of the federal government, wrote Madison, “extends to certain enumerated objects only, and leaves to the several States a residuary and inviolable sovereignty over all other objects.”
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http://thefederalist.com/2017/11/16/avoid-debacles-like-roy-moore-repeal-17th-amendment/