US Democratic presidential candidate Illinois Senator Barack Obama, his wife Michelle and daughters, wave during a rally at Ohio State House in Columbus, Ohio.[Emmanuel Dunand/AFP]

Obama and McCain hunted for support in the industrial states of Ohio and Pennsylvania in the final 48 hours of the White House race.

Obama is playing offense in the last two days, hitting Ohio, Florida, North Carolina and Virginia.

Polls show Obama ahead or running even in key states like Ohio, Florida, Virginia, Colorado, Indiana, North Carolina and Nevada.