A man participates in early voting as his 14-month-old daughter naps at the Chinatown Mall in Las Vegas, Nevada, on Saturday. [Agencies]

Obama — who also has the task of running the country as he campaigns for re-election — reviewed emergency preparations in a conference call with top domestic security and emergency assistance officials on Saturday as he flew to New Hampshire for a campaign appearance.

Once in the New Hampshire, Obama took a swipe at Romney's record as governor in the neighboring Massachusetts.

"Governor Romney has been out here making a lot of last-minute promises lately," the president told a crowd of 8,500 gathered in front of a school in the city of Nashua.

"Said he's all about fighting for the middle class. Said he would cut taxes for everybody," he said. "But the problem is, we heard those promises before."

Meanwhile at a campaign event in the town of Kissimmee, Florida, Romney urged the crowd to take advantage of the opportunity they have beginning on Saturday to cast their ballots.