WASHINGTON - US voters say that President Barack Obama performed better than Republican rival Mitt Romney by a substantial margin in their second debate, according to a Reuters/Ipsos poll released on Wednesday.

Forty-eight percent of registered voters gave the victory to Obama, while 33 percent say Romney prevailed in the Tuesday debate, the online poll found.

The poll reflects the broad consensus of debate observers who said Obama's forceful approach gave him the upper hand over Romney, who was widely seen as the victor in their first matchup on October 3.

"Clearly the debate was a bit of a turnaround for Obama. He put in a much stronger performance than he did in the first debate and it's showing in the numbers," said Ipsos pollster Julia Clark.

The accuracy of Reuters/Ipsos online polls is measured using a credibility interval. In this case, the survey of 655 online voters, conducted shortly after the debate, has a credibility interval of plus or minus 4.4 percentage points.

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