The latest Gallup Poll Daily tracking update on registered voters' presidential preferences shows Barack Obama with a modest four percentage point advantage over John McCain, 47% to 43%.

Voter preferences fluctuated in the time immediately after Obama's much publicized overseas trip. First, Obama's lead stretched to nine points near the conclusion of the trip, only to disappear when McCain moved into a precise tie with Obama near the end of last week. Now, the race seems to have reverted to where it has been for most of the summer, with Obama holding a narrow advantage.

-- Source: Gallup Poll