Democrat Barack Obama has a 4-point national lead over Republican John McCain as they head into the final week of the presidential campaign, according to a Reuters/C-SPAN/Zogby poll released on Tuesday.
Obama leads McCain by 49 percent to 45 percent among likely voters in the three-day national tracking poll, a slight dip from his 5-point advantage on Monday. The telephone poll has a margin of error of 2.9 percentage points.
McCain, a veteran Arizona senator, has sliced Obama's 12-point advantage by more than half in the last five days but he has not been able to break through the 45 percent support mark.
Probably more significant is Obama slipping under the 50 percent mark.
The real key will be to see if this signals movement in important state battles. That probably wouldn't be seen until later in the week.