Mamadou Tandja, president of the desert nation of Niger, has secured another three years in office and unlimited runs at future terms, in a referendum that opposition officials have called a coup d’etat in all but name. Tandja, a 71-year-old former army colonel, who had promised to step down after his second term expired in December, thanked voters even before the official results were announced on Friday by the country’s electoral commission. Giant posters appeared in the capital of Niamey by Thursday, expressing gratitude for the “renewed confidence” of voters. The commission said Tandja’s proposal for a new constitution received...