OTTAWA-(CP)-Prime Minister Justin Trudeau is stepping down as Liberal leader after almost a decade at the helm of the party. Here is a timeline of Trudeau’s rise to party leadership and prime minister, and the events that led him to give it all up. Oct. 14, 2008: Trudeau is elected as a Liberal member of Parliament in the Montreal riding of Papineau in a narrow victory over the Bloc Québécois. He served as an Opposition MP during the Conservative minority government. April 5, 2009: Trudeau is named Liberal critic for youth and multiculturalism. September 2010: Trudeau is appointed Liberal citizenship and immigration critic. May 2, 2011: Trudeau wins re-election in his riding, but the Liberals fall to third-party status in greatest defeat the party had ever known historically. The party…