RealClearPolitics - Election Other - President Obama Job Approval
It has been on a slide all year. It hit a peak of 53.8% (RCP avg) on Christmas day 2012, and is currently at 43.6, the low point so far for the year. His all-time high on RCP was 65.5 in Feb 2009, and his all time low was 42.2 in October, 2011. He seems to have an absolute floor of about 40%, who will approve no matter what. IIRC there was once a Gallup poll that had him at 39%, but he's never gone below 42.2 in the RCP avg.