Maybe that Rasmussen poll is an indication of where he's heading, or maybe it's an aberration, but Obama's poll numbers haven't appreciably changed in the past 60 days, accoring to the RealClearPolitics average of polls. Tom Bevan writes:
Some observers have noted that while President Obama has faced intense criticism over his handling of the Gulf Oil spill during the last eight weeks, his approval rating remains more or less unchanged. Indeed, on April 21, the day after the Deepwater Horizon rig exploded and sunk in the Gulf, President Obama’s approval rating in the RCP Average stood at 47.9% and his disapproval rating was at 46.9%. Despite all that’s transpired over the past two months, today President Obama’s approval rating in the RCP Average is two tenths of a point higher, at 48.1%, and his disapproval rating is five tenths of a point higher at 47.4%.