I'm quoting Maclean's Butts profile.
McGuinty’s big, expensive 2007 promise of a poverty-reduction strategy—which included the implementation of full-day kindergarten and an increase in Ontario’s minimum wage—served as both a rallying point for progressives and a wedge issue to differentiate the Liberal party from the provincial NDP, which, under leader Howard Hampton, had grown into a credible threat. “We put Hampton in a hell of a box in 2007. We outflanked him on the left,” Brodhead says.
The careful development and rollout of flashy, progressive policy, the polished delivery of it on the campaign trail, the all-important wedge issue to try to isolate the NDP: Gerald Butts’s fingerprints on the McGuinty campaigns in 2003 and 2007 are as evident on the deficit-spending Trudeau campaign of 2015.
Anyways, the point is that the Grit strategy was far from unpredictable.