Tom Mulcair: The real test for the Conservatives begins. Can they stave off the Liberal onslaught in seat-rich Ontario?

This election campaign has been as unpredictable as it has been unusual, and the real test is about to take place, says former NDP leader Tom Mulcair in an exclusive column for CTVNews.ca. Can the Conservatives stave off the full-bore Liberal onslaught in seat-rich Ontario?