He worked as a legislative aide for State Senator (and Union City Mayor) William Musto at the time of Musto's removal from the Senate for his conviction on receiving kickbacks from a developer. LaRocca was essentially handpicked by Musto to be the Democratic nominee for the special election to fill the remaining 1.5 years of the Senate term.[2] In his first bid for elected office, LaRocca defeated independent Libero Marotta, Republican Dennis Teti, and independent Carlos Munoz in a June 23, 1982, special election.[3][4] In the next regular election in 1983, LaRocca and then-Assemblyman Christopher Jackman switched seats where Jackman ran for Senate and LaRocca ran for Assembly. Both won their respective races.[5] After serving alongside Robert Ranieri for one term from the 33rd district, LaRocca did not seek reelection in 1985.[6]