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One by one the doubters have made their peace with medical science. Only four rulers in the world continue to deny the threat to public health posed by covid-19. Two are flotsam from the former Soviet Union, the despots of Belarus and Turkmenistan. A third is Daniel Ortega, the tropical dictator of Nicaragua. The other is the elected president of a great, if battered, democracy. Jair Bolsonaro’s undermining of his own government’s efforts to contain the virus may mark the beginning of the end of his presidency.