Democrat Barack Obama has a 4-point national lead over Republican John McCain as the White House rivals head into their final debate, according to a Reuters/C-SPAN/Zogby poll released on Wednesday. Obama leads McCain 48 percent to 44 percent among likely US voters in the latest four-day tracking poll, down slightly from Obama's 6-point advantage on Tuesday. The poll has a margin of error of 2.9 percentage points.
Obama's lead in the poll has remained stable, drifting between 4 and 6 percentage points for the last week. "It's not over, but it's not moving a lot," pollster John Zogby said. "There does not seem to be a dramatic shift going on." Obama and McCain meet in their third and final debate at Hofstra University in Hempstead, New York, on Wednesday night, giving McCain one last chance to reshape a presidential race that appears to be tilting toward Obama with less than three weeks before the November 4 election.