Local politics Dunn served as an alderman in
Holyoke, Massachusetts for two terms. In 1987, Dunn ran in the Holyoke mayoral election where he placed first out of three candidates in the primary, ahead of twelve-year incumbent Mayor Ernest E. Proulx. During the campaign both Dunn and Proulx were investigated by the Massachusetts Ethics Commission. Dunn defeated Proulx in the general election. He was reelected in 1989. On February 2, 1988, the board of alderman voted eleven to four to not welcome
Jane Fonda when she came to film
Union Street which Dunn stated was a "disaster for the city". Dunn declined the
NAACP's call for an independent review of police brutality charges in 1988. A Hispanic group withdrew its community service award for Dunn and disinvited him to a dinner after complaints of his support for the
English-only movement.
Massachusetts Senate In 1990,
John P. Burke announced that he would not seek reelection to the
Massachusetts Senate. Dunn, who had previously considered running for Hampden County district attorney, announced that he would run for the Democratic nomination to succeed Burke, which was the seat that was held by Dunn's uncle
Maurice A. Donahue. He won the Democratic nomination and defeated Republican nominee Walter R. Bilski in the general election. Dunn was appointed to serve on the Local affairs committee and as chairman of the School committee. He took office in the Massachusetts Senate in January 1991, and resigned from the Holyoke mayoralty on February 6, and was replaced by City Council President Joseph M. McGivern as acting mayor. Dunn announced that he would not seek reelection in 1992. In 1992, Dunn was named Legislator of the Year by the Massachusetts Teachers' Association. ==Later life==