Mr Obama's victory represented the pinnacle of a night of huge Democratic party gains, including new seats to add to existing majorities in both houses of Congress.
Barack Obama looked on an unstoppable course to capture the White House on Tuesday night as his Republican rival John McCain fast ran out of possibilities that would stem a Democratic victory.
With the count well-advanced in a majority of states, US networks projected an Obama victory in Ohio, a mid-western state without which no Republican has ever secured the presidency. He was also tipped to seize New Mexico from his Republican rival.
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