Robert Aubin (born May 26, 1960 in Trois-Rivières, Quebec) is a Canadian politician, who was elected to the Canadian House of Commons in the 2011 election. He represents the electoral district of Trois-Rivières as a member of the New Democratic Party.

He has a diploma in geography from Université Laval and a degree in music and education from the Université du Québec à Trois-Rivières.

At the time of his election, he had been a teacher at the Séminaire St-Joseph for nearly 25 years. He has also been a musician.

Jinny Jogindera Sims (born in India) is a Canadian politician, who was elected to the Canadian House of Commons in the 2011 election. She represents the electoral district of Newton—North Delta as a member of the New Democratic Party.

Sims emigrated from India to England at the age of nine. She has a Bachelor of Education at the University of Victoria in Manchester. Sims moved to Canada in 1975.

Thomas Joseph "Tom" Mulcair (born October 24, 1954) is the Leader of the Official Opposition in Canada, a lawyer, university professor, and politician. A New Democratic Party Member of Parliament for the electoral district of Outremont in Quebec since 2007, he was selected as the leader of the New Democratic Party, thus the Leader of the Official Opposition, in the leadership election on March 24, 2012, with 57.2% of the votes on the fourth and final ballot.

He was the provincial Member of the National Assembly of Quebec for the riding of Chomedey in Laval from 1994 to 2007, holding the seat for the Liberal Party of Quebec. He served as the Minister of Sustainable Development, Environment and Parks from 2003 until 2006, in the Liberal government of Premier Jean Charest. Elected MP for Outremont in a by-election in 2007, he was named Deputy Leader of the New Democratic Party, jointly with Libby Davies, shortly afterwards, and has won re-election twice.

On May 26, 2011, he was named the New Democratic Party's Opposition House Leader. On March 24, 2012, Thomas Mulcair was elected to be the new federal NDP leader, succeeding the late Jack Layton. Prior to entering politics, Mulcair was a senior civil servant in the Quebec provincial government, ran a private law practice, and taught law at the university level.