Cope conceded late Tuesday to Democratic incumbent Rep. Elizabeth Esty, who will return to Washington for her third term.
In the race for State Senate District 24, McLachlan beat back a challenge from Democrat Kenneth Gucker.
In the race for the State House, Republican incumbent Richard A. Smith ran unopposed and was re-elected.
In the local Sherman race for registrar of voters, Democrat incumbent Bill Petkanas and Republican incumbent Shelia J. McMahon were re-elected.
For the U.S. Senate, Sen. Richard Blumenthal, a Democrat, won re-election by topping Republican challenger Dan Carter of Bethel. Carter did not seek re-election to the State House due to his Senate run.
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