Canada

As much as people say the PC party is an Alberta-Manitoba party, it should be noted that the PCs got more seats in Ontario in the last federal election than in Alberta and Manitoba combined. The entrenched PC vote in Ontario is almost exclusively rural, and the voters are not just capital 'C' Conservative, then are lower-case 'c' conservative. They do not like change, especially any change in the status quo. The issues they deal with, are not the same issues that urban voters are concerned with, and the problems urban areas are facing demand transformative change.

But a bit of math: the stable Conservative base is usually quoted as '30%' or thereabouts. A 10% shift in this base only looks like a 3% shift overall. So stating the Conservative base is entrenched, ignores the realism that it takes a massive shift in the 'entrenched' Conservative base to make the overall numbers change significantly. The Conservatives only come to power when it is the Liberal and more importantly the NDP base that shifts.