Along with fellow QS spokesperson Françoise David, Khadir is currently one of the two most prominent members of Québec solidaire, a left-wing party whose province-wide support was 6.03 percent in the 2012 Quebec election.

He ran for a seat in the National Assembly of Quebec in the Montreal-based district of Mercier against Daniel Turp of the Parti Québécois in the 2003, 2007 and 2008 elections.

On his first attempt, he finished third with 18% of the vote under the Union des forces progressistes party line.
During Khadir's second bid, the first as part of the newly formed Québec Solidaire, he placed second, with 29% of the vote.

In 2008, Khadir won the seat and became the first Québec Solidaire candidate elected.
He garnered 39% of the vote.
During that campaign, Khadir received the endorsement of Robert Perreault, a former PQ cabinet member who represented the district from 1994 to 2000.

A poll conducted for the newspapers Le Devoir and The Montreal Gazette in early December 2010, established that Khadir was the most popular politician in Québec, with an approval rating of 45%.

Khadir retired from his seat effective as of the provincial general election on 1 October 2018.
Along with fellow QS spokesperson Françoise David, Khadir is currently one of the two most prominent members of Québec solidaire, a left-wing party whose province-wide support was 6.03 percent in the 2012 Quebec election.
He ran for a seat in the National Assembly of Quebec in the Montreal-based district of Mercier against Daniel Turp of the Parti Québécois in the 2003, 2007 and 2008 elections.
On his first attempt, he finished third with 18% of the vote under the Union des forces progressistes party line. During Khadir's second bid, the first as part of the newly formed Québec Solidaire, he placed second, with 29% of the vote.
In 2008, Khadir won the seat and became the first Québec Solidaire candidate elected. He garnered 39% of the vote. During that campaign, Khadir received the endorsement of Robert Perreault, a former PQ cabinet member who represented the district from 1994 to 2000.
A poll conducted for the newspapers Le Devoir and The Montreal Gazette in early December 2010, established that Khadir was the most popular politician in Québec, with an approval rating of 45%.
Khadir retired from his seat effective as of the provincial general election on 1 October 2018.
Amir Khadir