Obama also swept through territory typically friendly to Democrats in the East and Midwest.

McCain countered in the safest of Republican states.

That left the battlegrounds to settle the race: Florida, Ohio, Virginia, Colorado and more. Most were customarily Republican, but Obama spent millions hoping to peel away enough to make him the 44th president, and his triumph in Pennsylvania left the Republican with scant room for error.

"May God bless whoever wins tonight," President Bush told dinner guests at the White House, according to spokeswoman Dana Perino.

A jubilant crowd of thousands gathered in Grant Park in downtown Chicago on an unseasonably mild night, confident it would be Obama. They reacted each time Obama was announced the winner in another state _ and the cheers were particularly loud when Pennsylvania fell.

Interviews with voters suggested that almost six in 10 women were backing Obama nationwide, and men leaned his way by a narrow margin. Just over half of whites supported McCain, giving him a slim advantage in a group that Bush carried overwhelmingly in 2004.

The results of The Associated Press survey were based on a preliminary partial sample of nearly 10,000 voters in Election Day polls and in telephone interviews over the past week for early voters.

The same survey showed the economy was by far the top Election Day issue. Six in 10 voters said so, and none of the other top issues _ energy, Iraq, terrorism and health care _ was picked by more than one in 10.

The AP made its calls of individual states based on surveys of voters as they left the polls.

Obama led in electoral votes with 175 of the 270 needed to win the White House. McCain had 52.

The Democrat's states included Wisconsin, Michigan, New York, Rhode Island, Minnesota, Pennsylvania, New Hampshire, Vermont, Connecticut, Delaware, Illinois, Maine, Massachusetts, Maryland and New Jersey, as well as the District of Columbia.

McCain had Arkansas, Kentucky, Tennessee, Oklahoma, Wyoming, Alabama and South Carolina.

The nationwide popular vote was remarkably close. Totals from 13 percent of the nation's precincts showed Obama with 49.9 percent and McCain with 49.2.