This is basically a repeat of what we saw in the last election. The PCs reached their peak support numbers, but then they started scaring the crap out of everybody, and now support looks to be coalescing around the Liberals to keep the PCs out of power. What makes this interesting is that this has happened well before the start of the campaign, rather than midway through it.
Assuming this poll is correct, the Liberals have a clear path to victory. 33% of respondents say they support the NDP or Green, but a significant portion of them will ultimately vote Liberal to deny the PCs a victory. The Liberals are only 7 percentage points behind the PCs, so NDP/Green supporters switching support to Liberal will likely be enough for them to win. Further, just 3.5% of voters switching support from PC to Liberal would put the Liberals in the lead. Considering that the campaign hasn't even begun yet (so a lot of people likely are not paying attention), the Liberals should have a fairly easy job flipping a large enough number of voters from PC to Liberal.
The Liberals need to focus on not doing any dumb shit between now and election day (she can't have a repeat of her "old white people" comment). If I were Wynne, I wouldn't even bother personally attacking Ford on his more unsavoury traits. Directly attacking Ford puts her at risk of energizing Ford Nation. Rather, she should focus on Ford's policy deficiencies. Ford's own words and actions are doing more than enough to bring his character in question for most voters.
The PCs, meanwhile, need to focus on not scaring NDP, Green and moderate PC supporters into supporting the Liberals to deny the PCs a victory. The cat might be out of the bag on that one though. It's one thing if people are fleeing from your party because of a simple policy disagreement that can be walked back. It's a completely different thing when they're fleeing because of the fundamental character of the leader.