The 1865 United States Senate election in Massachusetts was held during January 1865. Incumbent Republican Senator Henry Wilson was re-elected easily to a second term as a member of the Republican Party.
At the time, Massachusetts elected United States senators by a majority vote of each separate house of the Massachusetts General Court, the House and the Senate.
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Text from the Wikipedia article “1865 United States Senate election in Massachusetts”, available under CC BY-SA 4.0.