Good results from the convention. Romney had no such bounce.
One report puts it this way:
Gallup, as usual, posted its latest poll findings at 1 pm--and found a big bounce for Obama from this year's convention, adding to yesterday's indication. They show a very strong one-day 3% hike in his approval rating to 52%--his highest mark in many months. This means that he gained a whopping 7% in just the past three days.