From their latest release:

Despite the intensity with which the healthcare debate has been waged in recent months, and President Obama’s ongoing involvement in that debate, there has been little change in the way Americans view Obama’s handling of healthcare policy across Gallup surveys conducted in July and August, and in the current Sept. 11-13 survey. Obama’s approval rating on healthcare has been 43% or 44% in all three surveys, and his disapproval rating has varied only slightly — between 49% and 52%.