Ad campaigns launched for and against Keystone pipeline Add to ... CTV News Published Monday, Apr. 08, 2013 2:50AM EDT Last updated Thursday, May 02, 2013 11:12AM EDT More on the commercials produced by Keystone pipeline critics, and the pro-pipeline ads from the Alberta government. Watch More Video: Explained: Canada's voting system (and how changing it would affect this election) Trudeau calls Harper's refugee policy 'disgusting' Malcolm-Jamal Warner opens up about Bill Cosby Surveillance Video Shows Hero Airman in Brawl Trump takes credit for McCarthy ending Speaker quest Grisly cattle mystery in B.C. leaves cows murdered, farmers spooked Clinton calls out GOP for 'ugly rhetoric' on immigration Stephen Harper speech interrupted by multiple protesters Harper says PMO 'never involved' in refugee applications Surveillance video shows daring escape of 17-year-old kidnap victim Police: Stone Stabbing 'Unfortunate Altercation' Conservatives committed to ratifying TPP: Trade minister Zunera Ishaq defends her right to wear a niqab for her citizenship ceremony Mulcair and Trudeau slam PMO audit of refugee applications I am being forced to unveil. That is oppression: Zunera Ishaq How did Putin celebrate his 63rd birthday? With a victory on the ice Israeli forces, Palestinians clash in escalating West Bank violence Raw footage catches moment Australian car chase enters the ocean Biden jokes about 'demotion' to Secretary of State Work by Medecins Sans Frontieres in Afghanistan jeopardized after air strike Comments AA More Related to this Story energy Video: Athabasca spill adds to Alberta oil's image problem Energy Video: Where do average Americans stand on the Keystone pipeline?