From NBC's Mark Murray
A new NBC News/Princeton Survey Research Associates International poll shows McCain with an 11-point lead over Obama among likely South Carolina voters, 53%-42%.
Yet that margin is smaller is among registered voters, 50%-44%.
Also don't miss this nugget from Princeton Survey pollster Evans Witt: cellphone respondents tend to back Obama by a greater percentage. "Unlike many state polls during the 2008 campaign, this survey included interviews on both landline phones and on cellphones in South Carolina. Among the landline interviews, McCain holds a 50% to 42% margin. But among cellphone interviews, the candidates are tied: McCain 48% and Obama 49%. Those interviewed on cell phone are more likely to be young and young voters heavily favor Obama."
The poll was conducted from October 25-28, and it has a margin of error of plus-minus 4% for registered voters and plus-minus 5% for likely voters.