Avi Lewis begins NDP leadership amid pushback from some party branches  CTV NewsNDP Leader Avi Lewis says ‘door is open’ to Prairie leaders opposed to his energy policies  CBCAvi Lewis, elected to lead Canada’s New Democratic party, promises ‘NDP comeback’  The GuardianNaheed Nenshi critical of federal NDP following Avi Lewis’s leadership victory  Calgary HeraldNew NDP Leader Avi Lewis acknowledges ‘hard conversations’ amid party divisions  CTV News