Obama v Romney: US votes in tight White House race

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Tens of millions of Americans have begun voting to decide whether to re-elect President Barack Obama or hand the job to Republican Mitt Romney.

The voting ends a hard-fought race that began nearly two years ago and has cost more than $2bn (£1.3bn).

Polls show the race is neck and neck, although the president holds a slender polling lead in vital swing states.

Adam Brookes reports.

For in depth coverage as the US goes to the polls: BBC US election special report

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