She was elected to the House of Commons of Canada in a 1987 by - election in the riding of Hamilton Mountain , replacing NDP incumbent Ian Deans .
From 1985 to 1987 Dewar was president of the federal NDP , succeeding Tony Penikett .
Dewar was elected to the House of Commons of Canada in a 1987 by - election in the riding of Hamilton Mountain , replacing NDP incumbent Ian Deans .
From 1985 to 1987 Dewar was president of the federal NDP , succeeding Tony Penikett .