FILE - In this Sept. 12, 2012, file photo President Barack Obama exits his limousine to board Air Force One as he leaves Las Vegas, Nevada, after campaigning. The Obama campaign's dominance of the ground game, the volunteer-driven nuts and bolts of electioneering that ranges from registration drives to door-to-door canvassing, contributed mightily to its 2008 victory in Nevada. Four years later the economy is floundering and the president's poll numbers are subpar, but his re-election campaign is banking on its advantage on the ground, assisted by a new array of digital innovations, to deliver victory once again. (AP Photo/John Gurzinski)

Associated Press
FILE - In this Sept. 12, 2012, file photo President Barack Obama exits his limousine to board Air Force One as he leaves Las Vegas, Nevada, after campaigning. The Obama campaign's dominance of the ground game, the volunteer-driven nuts and bolts of electioneering that ranges from registration drives to door-to-door canvassing, contributed mightily to its 2008 victory in Nevada. Four years later the economy is floundering and the president's poll numbers are subpar, but his re-election campaign is banking on its advantage on the ground, assisted by a new array of digital innovations, to deliver victory once again. (AP Photo/John Gurzinski)
FILE - In this Sept. 12, 2012, file photo President Barack Obama exits his limousine to board Air Force One as he leaves Las Vegas, Nevada, after campaigning. The Obama campaign's dominance of the ground game, the volunteer-driven nuts and bolts of electioneering that ranges from registration drives to door-to-door canvassing, contributed mightily to its 2008 victory in Nevada. Four years later the economy is floundering and the president's poll numbers are subpar, but his re-election campaign is banking on its advantage on the ground, assisted by a new array of digital innovations, to deliver victory once again. (AP Photo/John Gurzinski)
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