MONTREAL (AFP) - Canadian politician Jack Layton, whose huge popularity helped the New Democratic Party triple its electoral showing, died of cancer overnight at the age of 61, public CBC television announced Monday. The charismatic and well-respected Canadian opposition figure appeared before the media on July 25 to announce in a halting voice that he was temporarily giving up his stewardship of the party to battle cancer. He had revealed his prostate cancer in February 2010 and was operated on at the start of the electoral campaign in March.