United States senators have been elected directly by voters since 1913. Prior to that time, state legislatures chose the state’s senators. In the mid-1850s, however, the state legislature selection process began to fail due to political infighting and corruption. Often Senate seats were left vacant for long periods of time while state legislatures debated who to send to the Senate.
Who Elects Our Senators
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Resource provided by U.S. Capitol Visitor Center