After a string of surveys that seemed to indicate John McCain was reducing Barack Obama's polling edge, the most recent numbers suggest the Democratic nominee is holding on to his advantage nationally.

A new CNN Poll of Polls compiled Thursday evening indicates that 50 percent of likely voters are backing Sen. Obama for president, with 43 percent supporting Sen. McCain and 7 percent undecided.

The previous poll of polls, compiled earlier Thursday, suggested that Obama held a 5 point lead over McCain and the race was tightening.

Polling has also suggested the Democrats are making a late play for Arizona, McCain's home state.

Both candidates have continued to push hard in swing states, McCain concentrating on Ohio and Obama joining forces with Bill Clinton in Florida.

On the day Exxon Mobil set a quarterly profit record for a U.S. company, saying its third-quarter net profit was $14.83 billion, McCain accused Obama of working on the side of the oil industry.

"Sen. Obama voted for billions in corporate giveaways to the oil companies. I voted against it. When I am president, we are not going to let that happen," he said in Defiance, Ohio.

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