Some East Coast cities like Washington, Philadelphia and Boston were spared the worst effects from Sandy and appeared ready to return to normal by Wednesday. But New York City, large parts of New Jersey and some other areas will need at least several days to get back on their feet.
"The devastation is unthinkable," New Jersey Governor Chris Christie said after seeing pictures of the New Jersey shore.
The storm interrupted the U.S. presidential campaign just a week before the Nov. 6 election. The damage it caused raised questions about whether polling places in some hard-hit communities would be ready to open by next Tuesday.
Seeking to show he was staying on top of a storm situation that affected a densely populated region, the White House said President Barack Obama planned to tour damaged areas of New Jersey on Wednesday accompanied by Christie.
The New Jersey governor, who has been a strong supporter of Republican presidential challenger Mitt Romney, praised Obama and the federal response to the storm.
"New Jersey, New York in particular have been pounded by this storm. Connecticut has taken a big hit," Obama said during a visit to Red Cross headquarters in Washington.
Obama issued federal emergency decrees for New York and New Jersey, declaring that "major disasters" existed in both states.