William's younger brother Herbert Kenneth Diers (1896–1975) served five terms in the unicameral Nebraska Legislature (1950–1956, 1958–1962).
He and his brother continued to operate the family store following their father's death in 1926.
He won a narrowly divided five-way Democratic party primary with 23.85% of the vote but was defeated in the general election by Republican William E. Johnson.
The three members of the board had just resigned due to a scandal, and Peterson selected Diers over the candidate proposed by the Democratic state committee, Frank Sorrell, his opponent in the 1946 gubernatorial election.
[3][4] Diers was a candidate for lieutenant governor again in 1964 and received 4.36% of the vote in a crowded Democratic primary.