Sun political columnist Brian Lilley says Liberal leader Mark Carney made several gaffes, or faux pas, when he introduced a new Liberal candidate with the wrong last name. That candidate Nathalie Provost is a gun-control advocate and survivor of the1989 Ecole Polytechnique mass shooting - in Dec. 6, 1989 - known as the “Montreal Massacre.” Carney added that infamous shooting took place at Concordia University in Montreal.