<br/> In Burundi, voters are due to cast their ballots in a presidential election in which the outcome is already clear. The serving President Pierre Nkurunziza is the only candidate still running after all his opponents pulled out. The ballot is the first since the last of the country's rebel movement agreed last year to a ceasefire and to join elections. But diplomats have warned that the country is still in danger of slipping back into civil conflict. Today's vote ought to be the high point in Burundi's extended electoral marathon. A month ago the ruling party comfortably won local council elections in a poll that international observers said appeared to go well. But the opposition alleged widespread fraud and last week, an umbrella group of all opposition parties, called the Democratic Alliance for Change announced that they were all withdrawing from the presidential ballot. <br/> <br/>