The 3rd had long been the only Democratic outpost in traditionally heavily Republican East Tennessee ; indeed , Brock 's victory ended 40 years of Democratic control in the district .
In 1962 , he was elected to Congress from Tennessee 's 3rd congressional district , based in Chattanooga .
The 3rd had long been the only Democratic outpost in traditionally heavily Republican Tennessee   ; indeed , Brock 's victory ended 40 years of Democratic control in the district .
In 1962 , he was elected to Congress from Tennessee 's 3rd congressional district , based in Chattanooga .