Chief political correspondent Rosemary Barton speaks with Eric Grenier, a poll tracker and founder of The Writ newsletter, about how public opinion has shifted in week one of the federal election campaign. Plus, a panel of former MPs discuss how the parties are trying to win over voters. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX Follow CBC News on TikTok: https:/