Residents in the remote Pacific territory of Guam are to choose between US Democratic Party presidential candidates in a caucus vote.
Neither front-runner Barack Obama nor rival Hillary Clinton have campaigned in Guam.
The island has just four delegate votes at the national convention that selects a candidate for this year's presidential election.
But in a tight race, both candidates have courted Guam voters from afar.
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Mrs Clinton has described the contests as "game changers".
But the BBC's James Coomarasamy in Washington says that at this stage, the only thing that will really change the game is uncommitted "super delegates" - unelected senior party figures - making their choice known.
Both candidates have announced super delegate endorsements this week.
Mr Obama still leads in states, votes and delegates.
But he has had a tough week responding to comments by his former pastor, Jeremiah Wright, and to Mrs Clinton's plans for a summer suspension of the gasoline (petrol) tax, correspondents say.
A recent opinion poll showed that the number of Democrats who think Mr Obama will win the nomination had shrunk to just over half.
(BBC)
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