Democrat Elissa Slotkin defeated Rep. Mike Bishop (R-Mich.) in Michigan's 8th Congressional District. The race was called by the Associated Press on Wednesday morning.
Bishop had conceded defeat late Tuesday.
Slotkin unseated Bishop in a district long held by Republicans but faced a stiff challenge this year. The district also includes some more Democratic areas like Michigan State University.
Slotkin is a former CIA and Defense Department official and said she decided to challenge Bishop because of his vote to repeal ObamaCare last year.
Bishop is a former majority leader of the Michigan Senate first elected in 2014.