|Preceded by||Walt Elliot|
|Succeeded by||Ted Chudleigh|
December 20, 1948 |
|Political party||New Democrat|
|Occupation||Mediator, executive assistant|
Duignan was elected to the Ontario legislature in the 1990 provincial election, defeating incumbent Liberal Walt Elliot by 548 votes in the riding of Halton North. The NDP won a majority government and Duignan served as a parliamentary assistant to the Minister of Consumer and Commercial Relations from 1993 to 1995.
In the 1995 provincial election Duignan was defeated finishing third against Progressive Conservative candidate Ted Chudleigh. He ran for re-election in the 1999 provincial election in the riding of Dufferin—Peel—Wellington—Grey, but finished third against Progressive Conservative incumbent David Tilson. He was also a candidate of the federal NDP in the 2004 Canadian election, but finished third against Conservative Michael Chong in the riding of Wellington—Halton Hills.
Duignan trained in mediation with J.P. Ryan and Associates and the Law Society of Upper Canada and is a member of mediate.ca. He works as a housing consultant and is a director of Brant Alcove Rehabilitation Services, a drug and alcohol rehabilitation centre based in Brantford, Ontario. Duignan is also a member of Family Mediation Canada, the Ontario Association for Family Mediation, Conflict Resolution Network Canada, and the Co-Operative Housing Federation of Canada. He lives in Georgetown, Ontario.
- "Ontario election: Riding-by-riding voting results". The Globe and Mail. September 7, 1990. p. A12.
- Brennan, Richard (October 20, 1993). "Casino law missing no-loss clause". The Windsor Star. p. A3.
- Funston, Mike (July 7, 1994). "New act protects escarpment region". Toronto Star. p. BR1.
- "Summary of Valid Ballots by Candidate". Elections Ontario. June 8, 1995. Retrieved 2014-03-02.
- "Summary of Valid Ballots by Candidate". Elections Ontario. June 3, 1999. Retrieved 2014-03-02.
- "Election results...riding by riding". The Globe and Mail. June 29, 2004. p. A14.