This chapter discusses the results of national public opinion surveys that illuminate how ordinary citizens think about the medical evidence problem. The surveys demonstrate that doctors possess the influence, prestige, and standing to play a leadership role in educating the public about the inefficiencies and waste of the U.S. health care system. Because most Americans believe “doctor knows best,” they tend to have confidence in the advice of doctors, not only about individual medical problems, but also about broader health care reform issues. The surveys also reveal that Americans are naturally wary of health care reform proposals they fear could constrain physician discretion, such as requiring doctors to follow evidence-based clinical guidelines. The public's anxieties about proposals to make medicine more evidence based, however, can be overcome. Physician endorsements of such reforms significantly alleviate public fears. The survey results suggest that if doctors were to become forceful advocates for reform, their reputations as trusted, well-motivated experts position them to shape the views of ordinary citizens.