BAGHDAD, Iraq, Oct. 25 - Iraqi electoral officials announced today that a new constitution had been approved by voters, enshrining a legal foundation for the future governance of the country and paving the way for elections for a full-term government in December. Seventy-nine percent of voters approved the constitution in the nationwide referendum held on Oct. 15, the officials said. But the vote was sharply divided along ethnic and sectarian lines. The biggest support came from Shiites and Kurds, who make up about 80 percent of the population, while Sunni Arabs largely rejected the document. The constitution was widely expected...