Dawn Barlow will represent Democrats in the race to replace Diane Black in Tennessee's 6th Congressional District.
Barlow, a doctor from Rickman, is running to fill the open seat left by Black, a Republican who ran for Tennessee governor. Barlow will face Republican John Rose in the Nov. 6 general election.
Barlow defeated a field that included United Methodist minister Merrilee Wineinger of Hendersonville.
The large district in north Tennessee includes 17 counties and parts of two more.