The constitution established election to the U.S. House of Representatives by popular vote every two years and election to the U.S. Senate by the state legislatures every six years, with 1/3 of senators elected every two years. The idea was that the direct “will of the People” would be represented in the House with its shorter terms, and that the Senate would balance this with its indirect election of senators for longer terms. Rash legislative action by the House would be checked by the less-populist Senate.
However, the 17th amendment ratified in 1913 established the direct election of U.S. senators by popular vote. This meant that both the House and the Senate were now elected directly by the people, removing some of the checks that the Senate had previously provided.
Think Right or Wrong, Not Left or Right 