Exit polling shows the economy to be the most pressing concern on U.S. voters' minds.
Some 60 percent of voters Tuesday named the troubled economy as the most important issue facing the nation.
That finding was mirrored in two separate surveys of voters who had cast their ballots, conducted by CNN and the Associated Press.
No other issue was named the most important by more than one in 10 Americans.
In CNN's polling, 10 percent named Iraq as the top issue, while terrorism and health care were the most important for nine percent.
Exit polling on voters' preferences for president will not be released until voting stations begin to close.
Some information for this report was provided by AP.