So, as in the U.s., so also in Canada; there is broad-based opposition to SSM. So, the articles use of SSM as an example of how Christians running for office are outside the mainstream makes no sense.
That's correct.
The Prairie Provinces are most opposed to gay marriage (about 70%), while Ontario is about 65% opposed and Atlantic Canada is about 60% opposed. British Columbia seems to be nearly evenly split and Quebec is about 60-65% in support of gay marriage.