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This figure from Thirty-Thousand.org shows one facet of the Republican Party's assault on representation beginning in the 1920's. (enlarge)
It Was Our House of Representatives
"A government is republican in proportion as every member composing it has his equal voice in the direction of its concerns: not indeed in person, which would be impracticable beyond the limits of a city or small township, but by representatives chosen by himself and responsible to him at short periods." --Thomas Jefferson to Samuel Kercheval, 1816.