Nashua, New Hampshire (CNN) – In the latest sign of just how tight both presidential campaigns view the race, President Barack Obama rallied voters on Saturday in New Hampshire – a battleground state that caries just four electoral college votes.

Obama carried the state by a 10 points four years ago, but his fortunes in the Granite State now are considerably more in doubt. Obama's victory in 2008 was largely due to support from self-identified independents, who make up more than a third of the electorate.

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