Democrat Barack Obama has expanded his national lead over Republican John McCain in the U.S. presidential race in 6 percentage points, according to the Reuters / C-span / Zogby released on Monday polls.

Obama leads McCain 50 percent to 44 percent among voters in the United States, probably for the last three days monitoring the elections, and Obama is from 3-point advantage on Sunday. In the telephone survey error is 2.9 percentage points.

Rally Obama interrupted by a series of three consecutive days during which McCain won land on the Illinois senator for his final debate on Wednesday. It was the first time during the 14 days in a poll to follow that Obama has reached 50 percent.

"Obama is actually their consolidated basis, but now big leads among young people, African-Americans and Hispanics," said pollster John Zogby.

"Achieving 50 percent puts him in winning territory."

Obama has increased his support among two key swing group, which could have a significant impact on the 4th November elections. His edge with independent increased from 8 points to 11 points, but his lead among women increased from 6 points to 8 points.

McCain narrowly trails Obama among women and leads by 13 points, 53 percent to 40 percent for whites.

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