For you poll lovers.
In fact, the 9-point drop in the most recent quarter is the largest Gallup has ever measured for an elected president between the second and third quarters of his term, dating back to 1953. One president who was not elected to his first term -- Harry Truman -- had a 13-point drop between his second and third quarters in office in 1945 and 1946.
http://www.gallup.com/poll/123806/Obama-Quarterly-Approval-Average-Slips-Nine-Points.aspx