The Democratic incumbent, tied in polls with Mitt Romney ahead of next week’s election, begins a two-day trip to the swing states of Colorado, Ohio and Nevada while his Republican challenger travels to Virginia.
Obama viewed flooded and sand-swept neighborhoods of New Jersey on a helicopter tour of the state with Republican Governor Chris Christie on Wednesday.
“The entire country’s been watching. Everyone knows how hard Jersey has been hit,” Obama told residents at an evacuation shelter in the town of Brigantine.
Storm Sandy left at least 64 people dead in the US, cut power from millions of homes and paralysed transport on much of the eastern US seaboard.
It made landfall on Monday night in New Jersey, where some 20,000 people remain trapped in their homes by sewage-contaminated floodwater.
In New York City, the storm brought a record tidal surge that swamped the subway system and caused widespread blackouts.
Earlier, it killed nearly 70 people in the Caribbean and caused extensive crop destruction in impoverished Haiti.