Tredwell was elected to the 2nd United States Congress as an Anti-Administration man to fill the vacancy caused by the death of James Townsend, and was re-elected to the 3rd United States Congress, serving from October 24, 1791, to March 3, 1795.
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Townsend had defeated incumbent William Floyd (A) and, as he died before the first meeting of the 2nd Congress and the special election was won by Thomas Tredwell (A), there was no change of parties between the 1st and 2nd Congress