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Deeply-divided Americans vote on Tuesday with President Barack Obama holding a razor-thin lead over his Republican opponent Mitt Romney, an election that few political analysts thought would be this close even one month ago.

Stakes high for green energy as US election goes to the wire

Deeply-divided Americans vote on Tuesday with President Barack Obama holding a razor-thin lead over his Republican opponent Mitt Romney, an election that few political analysts thought would be this close even one month ago.

Deeply-divided Americans vote on Tuesday with President Barack Obama holding a razor-thin lead over his Republican opponent Mitt Romney, an election that few political analysts thought would be this close even one month ago.