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Mr. Obama plans to spend every day between now and Nov. 6 on the road in most of those states and others, though his schedule does call for him to be back in Washington some nights.

In canceling Mr.  Obama’s event Monday in Virginia, aides also considered the optics of urging thousands of people to venture out to a political rally in the midst of a raging storm.

Still, it was clear Mr. Obama’s team was working hard to ensure that the president could keep campaigning as long as possible before he was needed back in Washington.

His departure for Florida, where he’ll hold an event with former President Bill Clinton, was moved up from Monday morning to Sunday night in order to get ahead of the storm. Even though Monday’s late event in Virginia was scrapped, Mr. Obama and Mr. Clinton planned to squeeze in an evening rally in Youngstown, Ohio, before the president was to return to the White House.

Mr. Romney canceled three events in Virginia on Sunday and planned to spend the day campaigning with his running mate, Rep. Paul Ryan, in Ohio.

If bad weather keeps people in hard-hit battleground states from going to the polls, it could mess up the campaigns’ carefully crafted get-out-the-vote efforts.

Jennifer Psaki, Mr. Obama’s campaign spokeswoman, said the Democratic ticket was urging people to vote early when they can, especially if it helps them get to the polls before the storm.

“Safety comes first,” she said, “and that’s the case with early voting as well.”