What's not to like about Raitt's policies if you are one of many centrist voters?  Balance the budget and lower taxes (realistically, unlike Bernier's aspirations).  Improve health care.  Targeted infrastructure spending.  No values screening or the like.  She doesn't support the carbon tax, so that would appeal to the West, but at the same time she is well recognized in the GTA where the CPC critically needs to recapture seats in 2019.  She's also from Cape Breton and may even capture a few seats in the Maritimes.