Chief political correspondent Rosemary Barton speaks with this week's Sunday Scrum about Canada meeting the NATO commitment to spend two per cent of GDP on defence, and potential challenges maintaining that spending target. Plus, Avi Lewis's NDP leadership win and what the obstacles are for the party moving forward. Chapters: 00:00 Canada defence spending 10:51 Avi Lewis’ NDP leadership win »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and