The premise of "Ed Good, Rocko Bad" is based on the idiom "couldn't get elected dogcatcher", meaning someone is so unpopular or unqualified they would be unable to be elected to even the lowliest position. Dogcatcher is virtually never an elected office.
In "Ed Good, Rocko Bad", one of Ed's commercials implies Rocko was responsible for the 1958 Ford Edsel, which was a car that sold poorly because consumers considered them too large, unattractive, and overpriced.