Some speculation from John Miller (several weeks old, but not reported elsewhere as far as I know):
Sun Media's stated reasons for pulling out are as misleading and full of holes as some of its breezy tabloid news stories. I'm told the breaking point came earlier this month when Sun executives showed up bristling with anger at a press council hearing into a complaint from the Canadian Labour Congress about this story written by Brian Lilley, its chief parliamentary correspondent.
Yup. If its not Brian Lilley getting them into Dutch, its Ezra. And it its not Ezra its Krista Erickson.
Actually, its pretty much all of them, but for Akin.