He announced in 1967 that he would not seek re-election in 1970 , and intended to return to private practice in Springfield with his son .
Zimmerman ran for re-election in 1940 , 1946 , 1952 , 1958 , and 1964 , winning each time .
Zimmerman announced in 1967 that Zimmerman would not seek re-election in 1970 , and intended to return to private practice in Springfield with Zimmerman 's son .
Zimmerman ran for re-election in 1940 , 1946 , 1952 , 1958 , and 1964 , winning each time .