In the 1976 general election, Pusateri was the Republican candidate for Illinois Supreme Court to fill the vacancy left by the retirement of Thomas E. Kluczynski. Former Illinois Attorney General and Democratic candidate William G. Clark defeated Pusateri.[1] In 1977, at the recommendation of his 1976 opponent, Pusateri was appointed to the Illinois Appellate Court to fill the vacancy created by the death of John C. Hayes.[2] He was sworn in on May 31, 1977.[3] Less than a year later, Pusateri stepped down from the bench and was succeeded by L. Sheldon Brown.[4]