Before running for office, Duignan was an executive assistant to federal New Democratic Party MPs Derek Blackburn and Lyle Kristiansen.
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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.
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In the 1995 provincial election Duignan was defeated finishing third against Progressive Conservative candidate Ted Chudleigh.
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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.
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