The US Democratic Party is set to hold the last two primary elections in its marathon presidential nomination race.As Montana and South Dakota go to the polls, Barack Obama is widely thought to be poised to become the first black nominee of a major US political party.
Speculation is rife that rival Hillary Clinton may be close to pulling out.
Mr Obama, who has won more pledged delegates and has the party nomination within reach, is already eyeing the general election in November.
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