Rex Murphy, a Canadian newspaper, radio and television commentator who delighted his country’s conservatives with sharp attacks on environmentalists, liberal politicians and what he called their “woke politics,” died on May 9 in Toronto. His editor at The National Post, Kevin Libin, said Mr. Murphy died in a hospital. In his heyday, in the 1990s, Mr. Murphy was the rare political commentator who commanded a countrywide audience, skewering Canada’s elites as well as its sometimes fragile sense of nationhood. For 21 years, from 1994 to 2015, he was the host of “Cross Country Checkup,” a popular weekly radio call-in show aired by the Canadian Broadcasting Corporation. For much of that period he gave a weekly segment of commentary on the CBC’s main nightly TV news program, “The National.”