Gallup's seven-day tracking poll shows a tie in Likely Voters, 48%-48%, and an Obama lead of 50%-45% among Registered Voters.
Their numbers are here (to the right, yesterday's headline is on the left).
Gallup also said their three post-debate days (Thu, Fri, Sat) averaged out to a tie in RV (here). These are still in the tracking poll.
So to get to +5 in RV over seven days, the last three days plus last Wednesday should average out at... +8 Obama? +9? Which, using Gallup's LV screen, should translate to a +3 or +4 LV lead for Obama.
It's becoming increasingly clear that the Great Romney Comeback was a three-day wonder: the race will be tighter than pre-debate numbers indicated, but Obama has a clear advantage.