CHICAGO (Reuters) - President Barack Obama won the endorsement of retired General Colin Powell, a moderate Republican, on Thursday as he and Republican rival Mitt Romney engaged in frantic campaigning in battleground states to try to turn a razor-close race their way. Hoping to encourage other Democrats to vote ahead of the November 6 election, Obama cast his ballot early in his home town of Chicago. Romney portrayed himself as an agent of change during a day campaigning in Ohio with 12 days to go until the election. ...

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