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Obama to break off from campaign 

Hillary Clinton urges voters to elect Mr Obama
US Democratic presidential candidate Barack Obama is to leave the campaign trail for two days to visit his sick grandmother in Hawaii.

Madelyn Dunham, 85, who helped to raise Mr Obama, is said to be seriously ill.

Mr Obama has spoken of their strong bond and has referred to her in some of his most powerful campaign speeches.

BBC North America editor Justin Webb says despite Mr Obama's substantial lead over his rival, John McCain, his absence will make his staff nervous.

The 47-year-old Illinois senator has the advantage in the polls with two weeks to go until election day on 4 November, but is not sufficiently far ahead to be confident of victory, says our correspondent.