Washington: As the presidential poll campaign in the US moves towards its climax, independent surveys predict that incumbent Barack Obama holds an edge over rival Mitt Romney, but the two are locked in a virtual tie in the crucial battleground states believed to be holding the key.

The prestigious Pew Research Center, in its latest opinion poll, said that Obama has edged Romney in the final days of the presidential campaign by holding a 48 percent to 45 percent lead over Romney among likely voters.

According to Pew, Obama maintains his modest lead when the probable decisions of undecided voters are taken into account. "Our final estimate of the national popular vote is Obama 50 percent and Romney 47 percent, when the undecided vote is allocated between the two candidates based on several indicators and opinions," Pew said.

A week ago the race was tied at 47 percent for each candidate. Interviewing for the final pre-election survey was conducted October 31 and November 3 among 2,709 likely voters, it said. RealClearPolitics showed Obama leading by half a point in an average of all the major national polls, which is 0.3 point more than a day earlier.

However, it's a dead heat between Obama and Romney, says the latest poll released by CNN/ORC with the two candidates tied at 49 percent each.

"Forty-nine percent of likely voters questioned said they support the President, with an equal amount saying they back the former Massachusetts governor," the CNN/ORC International survey said.

According to C-Voter, Obama (49 percent) leads Romney (48 percent) by one point. Obama and Romney are virtually deadlocked at 48 percent in key swing states, according to the USA Today/Gallup poll, which shows a four-point bounce for the US President from
their last poll of these States in early October, taken days after a disappointing first presidential debate.

A day earlier a Politico/George Washington University survey had it tied at 48 percent.


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