Colorado congresswoman Lauren Boebert looks set to return to Washington after her Democratic challenger called her to concede the race on Friday.
The surprisingly tight House contest is still expected to head to a recount.
Ms Boebert led by just 551 votes of nearly 327,000 counted as of Thursday evening, said the Associated Press.
The 0.16% margin qualifies for an automatic recall under Colorado state law, which would delay an official call in the race.
Speaking on Friday, 10 days after last week’s midterm elections, Democrat Adam Frisch, 55, told supporters that he did not expect a recount to help him overtake Ms Boebert, a Republican.
“It would be disingenuous and unethical for us, or any other group, to continue to raise false hope and to encourage fundraising for a recount,” he said.
“Please, save your money for your groceries, your rent, your children.”
Ms Boebert said on Twitter that she was “so happy” to declare victory in the race.

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