WASHINGTON - After weeks of national polls showing the US presidential race as a near dead heat, a survey on Wednesday raised eyebrows by giving US President Barack Obama a commanding 13-point lead over his Republican rival Mitt Romney.

The Bloomberg poll showed Obama leading Romney 53 percent to 40 percent among likely voters. Most polls show the two candidates tied, or within a couple of points of one another.

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An average of polls compiled by RealClearPolitics.com has Obama leading Romney by 2.2 percentage points, at an average of 46.6 percent to 44.4 percent for Romney.

Bloomberg acknowledged that its survey result varied sharply from other recent polls. Reuters is a competitor of Bloomberg News.