In 1962 , he was elected to Congress from Tennessee 's 3rd congressional district , based in Chattanooga .
Brock had been reared as a Democrat , but became a Republican in the 1950s .
In 1962 , Brock was elected to Congress from Tennessee 's 3rd congressional district , based in Chattanooga .
Brock had been reared as a Democrat , but became a Republican in the 1950s .