U.S. Democratic presidential contender Barack Obama led his Republican rival John McCain by 6 percent in the latest "poll of polls" released by CNN Wednesday.

The "poll of polls" refers to the average of the five most recent national surveys of registered voters and it shows the Obama led McCain 47 to 41 percent with the 12 percent undecided.

The margin between the two presidential candidates has remained remarkably consistent since the prolonged Democratic presidential race came to an end in early June.

In the "poll of polls" on June 3, Obama and McCain were also separated by 6 points.

The latest poll of polls includes surveys from Gallup, CBS/NY Times, ABC/Washington Post, Quinnipiac, and Newsweek.

(Xinhua News Agency July 17, 2008)