WASHINGTON – President Barack Obama delivered a sober warning to millions in the path of Hurricane Sandy on Monday, declaring that even though food, water and generators have been moved into position, "this is going to be a difficult storm" with long-term power and transportation outages possible.

In a direct appeal to those who live in harm's way, the president said, "Please listen to what your state and local officials are saying. When they tell you to evacuate, you need to evacuate. Don't delay, don't pause, don't question the instructions that are being given because this is a powerful storm."

The president made his remarks in the White House briefing room eight days before the Nov. 6 election, and a few hours after he canceled a campaign appearance in Florida to return to Washington. He turned aside a question about the storm's impact on the campaign, saying safety was his top priority.