I think almost all political polls are overrated in terms of their relevance, but Gallup’s efforts to gauge the popularity of different occupational groups are underrated:
The very high ratings given to military officers is hugely important in understanding the politics of the war in Afghanistan. And the very high ratings given to health care providers is hugely important in understanding the politics of health care costs. Any given cut in spending might be a trimming of fat, or else it might lead to a major reduction in the availability of useful health care services. And in a standoff between a member of congress and a doctor or nurse over which it is, people are highly inclined to believe the member of congress is lying.