Poll Tracker

Barack Obama is leading John McCain 52 percent to 36 percent among registered voters with 3 percent for Ralph Nader, 1 percent for Libertarian Bob Barr and 8 percent for other candidates or undecided, according to a Pew Research Center poll conducted Oct. 23-26. The margin of error is 3 points. Among likely voters, Obama's margin is 53 percent to 38 percent. Pew says this is the fourth straight survey in which the GOP ticket has been edging down.

The poll found several "ominous" signs for McCain: his support is declining across most demographic blocs with the exception of white evangelical Protestants, Obama is running nearly even with him in "red" states that George Bush won in 2004, and Obama holds a 19 point lead among the 15 percent of voters who have already cast a ballot.

Obama also leads when it comes to how "strong" the level of support is among his backers, with 74 percent falling into that category compared to 56 percent for McCain.

Of the 8 percent of voters who are undecided, 29 percent say they might vote either was, 7 percent lean towards Obama, 7 percent lean towards McCain, 8 percent lean towards neither and 49 percent "don't know."