The polls predicted a re-election victory, maybe even a landslide. But a couple of weeks before the vote, Kenny Chiu, a member of Canada’s Parliament and a critic of China’s human rights record, was panicking. Something had flipped among the ethnic Chinese voters in his British Columbia district. “Initially, they were supportive,” he said. “And all of a sudden, they just vanished, vaporized, disappeared.” Longtime supporters originally from mainland China were not returning his calls. Volunteers reported icy greetings at formerly friendly homes. Chinese-language news outlets stopped covering him. And…