"The Senate of the United States shall be composed of two Senators from each State, chosen by the Legislature thereof for six Years...."
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James Madison, Federalist No. 39:
"The House of Representatives will derive its powers from the people of America; and the people will be represented in the same proportion, and on the same principle, as they are in the legislature of a particular State. So far the government is national, not federal. The Senate, on the other hand, will derive its powers from the States, as political and coequal societies; and these will be represented on the principle of equality in the Senate, as they now are in the existing Congress. So far the government is federal, not national."
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The Seventeenth Amendment to the U.S. Constitution, ratified 1913:
"The Senate of the United States shall be composed of two Senators from each State, elected by the people thereof, for six years...."
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America's Party Platform:
"We also call for the repeal of the Seventeenth Amendment. Its enactment greatly reduced the power of our state legislatures and state governments – which are much closer to the people – and damaged our system of federalism."